diff --git a/Gruntfile.js b/Gruntfile.js
index 45e7c4c5..b93b3cba 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -83,17 +83,26 @@ module.exports = function(grunt) {
               __filename: undefined,
               __dirname: undefined
             },
-            builtins: false
+            builtins: false,
+            debug: true
           },
           banner: grunt.file.read('lib/license_header.js').replace(/__VERSION__/, version)
         }
       }
     },
+    extract_sourcemap: {
+      all: {
+        files: {
+          'dist': ['dist/jszip.js'],
+        }
+      }
+    },
     uglify: {
       options: {
         mangle: true,
         preserveComments: false,
-        banner: grunt.file.read('lib/license_header.js').replace(/__VERSION__/, version)
+        banner: grunt.file.read('lib/license_header.js').replace(/__VERSION__/, version),
+        sourceMap: true
       },
       all: {
         src: 'dist/jszip.js',
@@ -107,6 +116,7 @@ module.exports = function(grunt) {
   grunt.loadNpmTasks('grunt-browserify');
   grunt.loadNpmTasks('grunt-contrib-jshint');
   grunt.loadNpmTasks('grunt-contrib-uglify');
+  grunt.loadNpmTasks('grunt-extract-sourcemap');
 
   // A task to cause Grunt to sit and wait, keeping the test server running
   grunt.registerTask("wait", function() {
@@ -121,6 +131,6 @@ module.exports = function(grunt) {
   } else {
     grunt.registerTask("test", ["jshint", "test-local"]);
   }
-  grunt.registerTask("build", ["browserify", "uglify"]);
+  grunt.registerTask("build", ["browserify", "extract_sourcemap", "uglify"]);
   grunt.registerTask("default", ["jshint", "build"]);
 };
diff --git a/package-lock.json b/package-lock.json
index 2bf79322..598863dd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,8 +10,8 @@
       "integrity": "sha1-cH92HgHa6eFvG8+TcDt4xwlmV5o=",
       "dev": true,
       "requires": {
-        "jsonparse": "1.3.1",
-        "through": "2.3.8"
+        "jsonparse": "^1.2.0",
+        "through": ">=2.2.7 <3"
       }
     },
     "abbrev": {
@@ -26,7 +26,7 @@
       "integrity": "sha1-63d99gEXI6OxTopywIBcjoZ0a9I=",
       "dev": true,
       "requires": {
-        "mime-types": "2.1.22",
+        "mime-types": "~2.1.18",
         "negotiator": "0.6.1"
       },
       "dependencies": {
@@ -42,7 +42,7 @@
           "integrity": "sha512-aGl6TZGnhm/li6F7yx82bJiBZwgiEa4Hf6CNr8YO+r5UHr53tSTYZb102zyU50DOWWKeOv0uQLRL0/9EiKWCog==",
           "dev": true,
           "requires": {
-            "mime-db": "1.38.0"
+            "mime-db": "~1.38.0"
           }
         }
       }
@@ -54,41 +54,49 @@
       "dev": true
     },
     "adm-zip": {
-      "version": "0.4.13",
-      "resolved": "https://registry.npmjs.org/adm-zip/-/adm-zip-0.4.13.tgz",
-      "integrity": "sha512-fERNJX8sOXfel6qCBCMPvZLzENBEhZTzKqg6vrOW5pvoEaQuJhRU4ndTAh6lHOxn1I6jnz2NHra56ZODM751uw==",
+      "version": "0.4.16",
+      "resolved": "https://registry.npmjs.org/adm-zip/-/adm-zip-0.4.16.tgz",
+      "integrity": "sha512-TFi4HBKSGfIKsK5YCkKaaFG2m4PEDyViZmEwof3MTIgzimHLto6muaHVpbrljdIvIrFZzEq/p4nafOeLcYegrg==",
       "dev": true
     },
     "agent-base": {
-      "version": "4.3.0",
-      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-4.3.0.tgz",
-      "integrity": "sha512-salcGninV0nPrwpGNn4VTXBb1SOuXQBiqbrNXoeizJsHrsL6ERFM2Ne3JUSBWRE6aeNJI2ROP/WEEIDUiDe3cg==",
-      "dev": true,
-      "requires": {
-        "es6-promisify": "5.0.0"
-      }
-    },
-    "ajv": {
-      "version": "4.11.8",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
-      "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-6.0.2.tgz",
+      "integrity": "sha512-RZNwNclF7+MS/8bDg70amg32dyeZGZxiDuQmZxKLAlQjr3jGyLx+4Kkk58UO7D2QdgFIQCovuSuZESne6RG6XQ==",
       "dev": true,
       "requires": {
-        "co": "4.6.0",
-        "json-stable-stringify": "1.0.1"
+        "debug": "4"
       },
       "dependencies": {
-        "json-stable-stringify": {
-          "version": "1.0.1",
-          "resolved": "https://registry.npmjs.org/json-stable-stringify/-/json-stable-stringify-1.0.1.tgz",
-          "integrity": "sha1-mnWdOcXy/1A/1TAGRu1EX4jE+a8=",
+        "debug": {
+          "version": "4.3.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.1.tgz",
+          "integrity": "sha512-doEwdvm4PCeK4K3RQN2ZC2BYUBaxwLARCqZmMjtF8a51J2Rb0xpVloFRnCODwqjpwnAoao4pelN8l3RJdv3gRQ==",
           "dev": true,
           "requires": {
-            "jsonify": "0.0.0"
+            "ms": "2.1.2"
           }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
         }
       }
     },
+    "ajv": {
+      "version": "6.12.6",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+      "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
+      "dev": true,
+      "requires": {
+        "fast-deep-equal": "^3.1.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      }
+    },
     "ansi-regex": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
@@ -107,8 +115,8 @@
       "integrity": "sha512-0XNayC8lTHQ2OI8aljNCN3sSx6hsr/1+rlcDAotXJR7C1oZZHCNsfpbKwMjRA3Uqb5tF1Rae2oloTr4xpq+WjA==",
       "dev": true,
       "requires": {
-        "micromatch": "2.3.11",
-        "normalize-path": "2.1.1"
+        "micromatch": "^2.1.5",
+        "normalize-path": "^2.0.0"
       }
     },
     "argparse": {
@@ -117,8 +125,8 @@
       "integrity": "sha1-z9AeD7uj1srtBJ+9dY1A9lGW9Xw=",
       "dev": true,
       "requires": {
-        "underscore": "1.7.0",
-        "underscore.string": "2.4.0"
+        "underscore": "~1.7.0",
+        "underscore.string": "~2.4.0"
       },
       "dependencies": {
         "underscore.string": {
@@ -135,7 +143,7 @@
       "integrity": "sha1-jzuCf5Vai9ZpaX5KQlasPOrjVs8=",
       "dev": true,
       "requires": {
-        "arr-flatten": "1.1.0"
+        "arr-flatten": "^1.0.1"
       }
     },
     "arr-flatten": {
@@ -169,10 +177,13 @@
       "dev": true
     },
     "asn1": {
-      "version": "0.2.3",
-      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
-      "integrity": "sha1-2sh4dxPJlmhJ/IGAd36+nB3fO4Y=",
-      "dev": true
+      "version": "0.2.4",
+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
+      "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
+      "dev": true,
+      "requires": {
+        "safer-buffer": "~2.1.0"
+      }
     },
     "asn1.js": {
       "version": "4.9.1",
@@ -180,9 +191,9 @@
       "integrity": "sha1-SLokC0WpKA6UdImQull9IWYX/UA=",
       "dev": true,
       "requires": {
-        "bn.js": "4.11.8",
-        "inherits": "2.0.3",
-        "minimalistic-assert": "1.0.0"
+        "bn.js": "^4.0.0",
+        "inherits": "^2.0.1",
+        "minimalistic-assert": "^1.0.0"
       }
     },
     "assert": {
@@ -195,9 +206,9 @@
       }
     },
     "assert-plus": {
-      "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-0.2.0.tgz",
-      "integrity": "sha1-104bh+ev/A24qttwIfP+SBAasjQ=",
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
       "dev": true
     },
     "astw": {
@@ -206,7 +217,7 @@
       "integrity": "sha1-e9QXhNMkk5h66yOba04cV6hzuRc=",
       "dev": true,
       "requires": {
-        "acorn": "4.0.13"
+        "acorn": "^4.0.3"
       }
     },
     "async": {
@@ -234,15 +245,15 @@
       "dev": true
     },
     "aws-sign2": {
-      "version": "0.6.0",
-      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.6.0.tgz",
-      "integrity": "sha1-FDQt0428yU0OW4fXY81jYSwOeU8=",
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
+      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
       "dev": true
     },
     "aws4": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.6.0.tgz",
-      "integrity": "sha1-g+9cqGCysy5KDe7e6MdxudtXRx4=",
+      "version": "1.11.0",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.11.0.tgz",
+      "integrity": "sha512-xh1Rl34h6Fi1DC2WWKfxUTVqRsNnr6LsKz2+hfwDxQJWmrx8+c7ylaqBMcHfl1U1r2dsifOvKX3LQuLNZ+XSvA==",
       "dev": true
     },
     "balanced-match": {
@@ -281,13 +292,12 @@
       "dev": true
     },
     "bcrypt-pbkdf": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.1.tgz",
-      "integrity": "sha1-Y7xdy2EzG5K8Bf1SiVPDNGKgb40=",
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
+      "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
       "dev": true,
-      "optional": true,
       "requires": {
-        "tweetnacl": "0.14.5"
+        "tweetnacl": "^0.14.3"
       }
     },
     "binary-extensions": {
@@ -302,22 +312,13 @@
       "integrity": "sha512-ItfYfPLkWHUjckQCk8xC+LwxgK8NYcXywGigJgSwOP8Y2iyWT4f2vsZnoOXTTbo+o5yXmIUJ4gn5538SO5S3gA==",
       "dev": true
     },
-    "boom": {
-      "version": "2.10.1",
-      "resolved": "https://registry.npmjs.org/boom/-/boom-2.10.1.tgz",
-      "integrity": "sha1-OciRjO/1eZ+D+UkqhI9iWt0Mdm8=",
-      "dev": true,
-      "requires": {
-        "hoek": "2.16.3"
-      }
-    },
     "brace-expansion": {
       "version": "1.1.8",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.8.tgz",
       "integrity": "sha1-wHshHHyVLsH479Uad+8NHTmQopI=",
       "dev": true,
       "requires": {
-        "balanced-match": "1.0.0",
+        "balanced-match": "^1.0.0",
         "concat-map": "0.0.1"
       }
     },
@@ -327,9 +328,9 @@
       "integrity": "sha1-uneWLhLf+WnWt2cR6RS3N4V79qc=",
       "dev": true,
       "requires": {
-        "expand-range": "1.8.2",
-        "preserve": "0.2.0",
-        "repeat-element": "1.1.2"
+        "expand-range": "^1.8.1",
+        "preserve": "^0.2.0",
+        "repeat-element": "^1.1.2"
       }
     },
     "brorand": {
@@ -344,11 +345,11 @@
       "integrity": "sha1-+GzWzvT1MAyOY+B6TVEvZfv/RTE=",
       "dev": true,
       "requires": {
-        "JSONStream": "1.3.1",
-        "combine-source-map": "0.7.2",
-        "defined": "1.0.0",
-        "through2": "2.0.3",
-        "umd": "3.0.1"
+        "JSONStream": "^1.0.3",
+        "combine-source-map": "~0.7.1",
+        "defined": "^1.0.0",
+        "through2": "^2.0.0",
+        "umd": "^3.0.0"
       }
     },
     "browser-resolve": {
@@ -374,52 +375,52 @@
       "integrity": "sha1-03F5y7IiF57Pcw7H5iXpmGd5AtQ=",
       "dev": true,
       "requires": {
-        "JSONStream": "1.3.1",
-        "assert": "1.3.0",
-        "browser-pack": "6.0.2",
-        "browser-resolve": "1.11.2",
-        "browserify-zlib": "0.1.4",
-        "buffer": "4.9.1",
-        "concat-stream": "1.5.2",
-        "console-browserify": "1.1.0",
-        "constants-browserify": "1.0.0",
-        "crypto-browserify": "3.11.1",
-        "defined": "1.0.0",
-        "deps-sort": "2.0.0",
-        "domain-browser": "1.1.7",
-        "duplexer2": "0.1.4",
-        "events": "1.1.1",
-        "glob": "5.0.15",
-        "has": "1.0.1",
-        "htmlescape": "1.1.1",
-        "https-browserify": "0.0.1",
-        "inherits": "2.0.3",
-        "insert-module-globals": "7.0.1",
-        "labeled-stream-splicer": "2.0.0",
-        "module-deps": "4.1.1",
-        "os-browserify": "0.1.2",
-        "parents": "1.0.1",
-        "path-browserify": "0.0.0",
-        "process": "0.11.10",
-        "punycode": "1.4.1",
-        "querystring-es3": "0.2.1",
-        "read-only-stream": "2.0.0",
-        "readable-stream": "2.3.6",
-        "resolve": "1.4.0",
-        "shasum": "1.0.2",
-        "shell-quote": "1.6.1",
-        "stream-browserify": "2.0.1",
-        "stream-http": "2.7.2",
-        "string_decoder": "0.10.31",
-        "subarg": "1.0.0",
-        "syntax-error": "1.3.0",
-        "through2": "2.0.3",
-        "timers-browserify": "1.4.2",
-        "tty-browserify": "0.0.0",
-        "url": "0.11.0",
-        "util": "0.10.3",
-        "vm-browserify": "0.0.4",
-        "xtend": "4.0.1"
+        "JSONStream": "^1.0.3",
+        "assert": "~1.3.0",
+        "browser-pack": "^6.0.1",
+        "browser-resolve": "^1.11.0",
+        "browserify-zlib": "~0.1.2",
+        "buffer": "^4.1.0",
+        "concat-stream": "~1.5.1",
+        "console-browserify": "^1.1.0",
+        "constants-browserify": "~1.0.0",
+        "crypto-browserify": "^3.0.0",
+        "defined": "^1.0.0",
+        "deps-sort": "^2.0.0",
+        "domain-browser": "~1.1.0",
+        "duplexer2": "~0.1.2",
+        "events": "~1.1.0",
+        "glob": "^5.0.15",
+        "has": "^1.0.0",
+        "htmlescape": "^1.1.0",
+        "https-browserify": "~0.0.0",
+        "inherits": "~2.0.1",
+        "insert-module-globals": "^7.0.0",
+        "labeled-stream-splicer": "^2.0.0",
+        "module-deps": "^4.0.2",
+        "os-browserify": "~0.1.1",
+        "parents": "^1.0.1",
+        "path-browserify": "~0.0.0",
+        "process": "~0.11.0",
+        "punycode": "^1.3.2",
+        "querystring-es3": "~0.2.0",
+        "read-only-stream": "^2.0.0",
+        "readable-stream": "^2.0.2",
+        "resolve": "^1.1.4",
+        "shasum": "^1.0.0",
+        "shell-quote": "^1.4.3",
+        "stream-browserify": "^2.0.0",
+        "stream-http": "^2.0.0",
+        "string_decoder": "~0.10.0",
+        "subarg": "^1.0.0",
+        "syntax-error": "^1.1.1",
+        "through2": "^2.0.0",
+        "timers-browserify": "^1.0.1",
+        "tty-browserify": "~0.0.0",
+        "url": "~0.11.0",
+        "util": "~0.10.1",
+        "vm-browserify": "~0.0.1",
+        "xtend": "^4.0.0"
       }
     },
     "browserify-aes": {
@@ -428,11 +429,11 @@
       "integrity": "sha1-Xncl297x/Vkw1OurSFZ85FHEigo=",
       "dev": true,
       "requires": {
-        "buffer-xor": "1.0.3",
-        "cipher-base": "1.0.4",
-        "create-hash": "1.1.3",
-        "evp_bytestokey": "1.0.2",
-        "inherits": "2.0.3"
+        "buffer-xor": "^1.0.2",
+        "cipher-base": "^1.0.0",
+        "create-hash": "^1.1.0",
+        "evp_bytestokey": "^1.0.0",
+        "inherits": "^2.0.1"
       }
     },
     "browserify-cipher": {
@@ -441,9 +442,9 @@
       "integrity": "sha1-mYgkSHS/XtTijalWZtzWasj8Njo=",
       "dev": true,
       "requires": {
-        "browserify-aes": "1.0.6",
-        "browserify-des": "1.0.0",
-        "evp_bytestokey": "1.0.2"
+        "browserify-aes": "^1.0.4",
+        "browserify-des": "^1.0.0",
+        "evp_bytestokey": "^1.0.0"
       }
     },
     "browserify-des": {
@@ -452,9 +453,9 @@
       "integrity": "sha1-2qJ3cXRwki7S/hhZQRihdUOXId0=",
       "dev": true,
       "requires": {
-        "cipher-base": "1.0.4",
-        "des.js": "1.0.0",
-        "inherits": "2.0.3"
+        "cipher-base": "^1.0.1",
+        "des.js": "^1.0.0",
+        "inherits": "^2.0.1"
       }
     },
     "browserify-rsa": {
@@ -463,8 +464,8 @@
       "integrity": "sha1-IeCr+vbyApzy+vsTNWenAdQTVSQ=",
       "dev": true,
       "requires": {
-        "bn.js": "4.11.8",
-        "randombytes": "2.0.5"
+        "bn.js": "^4.1.0",
+        "randombytes": "^2.0.1"
       }
     },
     "browserify-sign": {
@@ -473,13 +474,13 @@
       "integrity": "sha1-qk62jl17ZYuqa/alfmMMvXqT0pg=",
       "dev": true,
       "requires": {
-        "bn.js": "4.11.8",
-        "browserify-rsa": "4.0.1",
-        "create-hash": "1.1.3",
-        "create-hmac": "1.1.6",
-        "elliptic": "6.4.0",
-        "inherits": "2.0.3",
-        "parse-asn1": "5.1.0"
+        "bn.js": "^4.1.1",
+        "browserify-rsa": "^4.0.0",
+        "create-hash": "^1.1.0",
+        "create-hmac": "^1.1.2",
+        "elliptic": "^6.0.0",
+        "inherits": "^2.0.1",
+        "parse-asn1": "^5.0.0"
       }
     },
     "browserify-zlib": {
@@ -488,7 +489,7 @@
       "integrity": "sha1-uzX4pRn2AOD6a4SFJByXnQFB+y0=",
       "dev": true,
       "requires": {
-        "pako": "0.2.9"
+        "pako": "~0.2.0"
       },
       "dependencies": {
         "pako": {
@@ -505,9 +506,9 @@
       "integrity": "sha1-bRu2AbB6TvztlwlBMgkwJ8lbwpg=",
       "dev": true,
       "requires": {
-        "base64-js": "1.2.1",
-        "ieee754": "1.1.8",
-        "isarray": "1.0.0"
+        "base64-js": "^1.0.2",
+        "ieee754": "^1.1.4",
+        "isarray": "^1.0.0"
       }
     },
     "buffer-xor": {
@@ -540,11 +541,11 @@
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@@ -1223,8 +1213,8 @@
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-            "inherits": "2.0.3",
-            "minimatch": "0.3.0"
+            "inherits": "2",
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@@ -1239,8 +1229,8 @@
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-            "sigmund": "1.0.1"
+            "lru-cache": "2",
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@@ -1257,7 +1247,7 @@
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       "dev": true,
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-        "for-in": "1.0.2"
+        "for-in": "^1.0.1"
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@@ -1267,14 +1257,14 @@
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-      "integrity": "sha1-M8GDrPGTJ27KqYFDpp6Uv+4XUNE=",
+      "version": "2.3.3",
+      "resolved": "https://registry.npmjs.org/form-data/-/form-data-2.3.3.tgz",
+      "integrity": "sha512-1lLKB2Mu3aGP1Q/2eCOx0fNbRMe7XdwktwOruhfqqd0rIJWwN4Dh+E3hrPSlDCXnSR7UtZ1N38rVXm+6+MEhJQ==",
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-        "combined-stream": "1.0.5",
-        "mime-types": "2.1.16"
+        "asynckit": "^0.4.0",
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@@ -1296,8 +1286,8 @@
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-        "node-pre-gyp": "0.10.3"
+        "nan": "^2.9.2",
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@@ -1309,7 +1299,8 @@
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@@ -1323,21 +1314,23 @@
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-            "readable-stream": "2.3.6"
+            "delegates": "^1.0.0",
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@@ -1350,17 +1343,20 @@
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@@ -1401,7 +1397,7 @@
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@@ -1416,14 +1412,14 @@
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-            "string-width": "1.0.2",
-            "strip-ansi": "3.0.1",
-            "wide-align": "1.1.3"
+            "aproba": "^1.0.3",
+            "console-control-strings": "^1.0.0",
+            "has-unicode": "^2.0.0",
+            "object-assign": "^4.1.0",
+            "signal-exit": "^3.0.0",
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+            "strip-ansi": "^3.0.1",
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@@ -1432,12 +1428,12 @@
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-            "inherits": "2.0.3",
-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
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@@ -1452,7 +1448,7 @@
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+            "safer-buffer": ">= 2.1.2 < 3"
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@@ -1461,7 +1457,7 @@
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+            "minimatch": "^3.0.4"
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@@ -1470,14 +1466,15 @@
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-            "once": "1.4.0",
-            "wrappy": "1.0.2"
+            "once": "^1.3.0",
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@@ -1489,8 +1486,9 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -1503,22 +1501,25 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
-            "brace-expansion": "1.1.11"
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           "bundled": true,
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           "version": "2.3.5",
           "bundled": true,
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@@ -1527,13 +1528,14 @@
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+            "minipass": "^2.2.1"
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           "version": "0.5.1",
           "bundled": true,
           "dev": true,
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@@ -1550,9 +1552,9 @@
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-            "iconv-lite": "0.4.24",
-            "sax": "1.2.4"
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@@ -1561,16 +1563,16 @@
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-            "rc": "1.2.8",
-            "rimraf": "2.6.3",
-            "semver": "5.6.0",
-            "tar": "4.4.8"
+            "detect-libc": "^1.0.2",
+            "mkdirp": "^0.5.1",
+            "needle": "^2.2.1",
+            "nopt": "^4.0.1",
+            "npm-packlist": "^1.1.6",
+            "npmlog": "^4.0.2",
+            "rc": "^1.2.7",
+            "rimraf": "^2.6.1",
+            "semver": "^5.3.0",
+            "tar": "^4"
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@@ -1579,8 +1581,8 @@
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           "requires": {
-            "abbrev": "1.1.1",
-            "osenv": "0.1.5"
+            "abbrev": "1",
+            "osenv": "^0.1.4"
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@@ -1595,8 +1597,8 @@
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-            "ignore-walk": "3.0.1",
-            "npm-bundled": "1.0.5"
+            "ignore-walk": "^3.0.1",
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@@ -1605,16 +1607,17 @@
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-            "console-control-strings": "1.1.0",
-            "gauge": "2.7.4",
-            "set-blocking": "2.0.0"
+            "are-we-there-yet": "~1.1.2",
+            "console-control-strings": "~1.1.0",
+            "gauge": "~2.7.3",
+            "set-blocking": "~2.0.0"
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           "version": "1.0.1",
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@@ -1626,8 +1629,9 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
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+            "wrappy": "1"
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@@ -1648,8 +1652,8 @@
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-            "os-tmpdir": "1.0.2"
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@@ -1670,10 +1674,10 @@
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-            "minimist": "1.2.0",
-            "strip-json-comments": "2.0.1"
+            "deep-extend": "^0.6.0",
+            "ini": "~1.3.0",
+            "minimist": "^1.2.0",
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@@ -1690,13 +1694,13 @@
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-            "util-deprecate": "1.0.2"
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+            "inherits": "~2.0.3",
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@@ -1705,13 +1709,14 @@
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@@ -1747,10 +1752,11 @@
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-            "is-fullwidth-code-point": "1.0.0",
-            "strip-ansi": "3.0.1"
+            "code-point-at": "^1.0.0",
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@@ -1759,15 +1765,16 @@
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           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
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+            "ansi-regex": "^2.0.0"
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@@ -1782,13 +1789,13 @@
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-            "minizlib": "1.2.1",
-            "mkdirp": "0.5.1",
-            "safe-buffer": "5.1.2",
-            "yallist": "3.0.3"
+            "chownr": "^1.1.1",
+            "fs-minipass": "^1.2.5",
+            "minipass": "^2.3.4",
+            "minizlib": "^1.1.1",
+            "mkdirp": "^0.5.0",
+            "safe-buffer": "^5.1.2",
+            "yallist": "^3.0.2"
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@@ -1803,18 +1810,20 @@
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           "optional": true,
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-            "string-width": "1.0.2"
+            "string-width": "^1.0.2 || 2"
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         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "3.0.3",
           "bundled": true,
-          "dev": true
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@@ -1836,15 +1845,7 @@
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-          "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
-          "dev": true
-        }
+        "assert-plus": "^1.0.0"
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@@ -1853,11 +1854,11 @@
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-        "inherits": "2.0.3",
-        "minimatch": "3.0.4",
-        "once": "1.4.0",
-        "path-is-absolute": "1.0.1"
+        "inflight": "^1.0.4",
+        "inherits": "2",
+        "minimatch": "2 || 3",
+        "once": "^1.3.0",
+        "path-is-absolute": "^1.0.0"
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@@ -1866,8 +1867,8 @@
       "integrity": "sha1-27Fk9iIbHAscz4Kuoyi0l98Oo8Q=",
       "dev": true,
       "requires": {
-        "glob-parent": "2.0.0",
-        "is-glob": "2.0.1"
+        "glob-parent": "^2.0.0",
+        "is-glob": "^2.0.0"
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@@ -1876,7 +1877,7 @@
       "integrity": "sha1-gTg9ctsFT8zPUzbaqQLxgvbtuyg=",
       "dev": true,
       "requires": {
-        "is-glob": "2.0.1"
+        "is-glob": "^2.0.0"
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@@ -1891,26 +1892,26 @@
       "integrity": "sha1-VpN81RlDJK3/bSB2MYMqnWuk5/A=",
       "dev": true,
       "requires": {
-        "async": "0.1.22",
-        "coffee-script": "1.3.3",
-        "colors": "0.6.2",
+        "async": "~0.1.22",
+        "coffee-script": "~1.3.3",
+        "colors": "~0.6.2",
         "dateformat": "1.0.2-1.2.3",
-        "eventemitter2": "0.4.14",
-        "exit": "0.1.2",
-        "findup-sync": "0.1.3",
-        "getobject": "0.1.0",
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-        "grunt-legacy-log": "0.1.3",
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-        "hooker": "0.2.3",
-        "iconv-lite": "0.2.11",
-        "js-yaml": "2.0.5",
-        "lodash": "0.9.2",
-        "minimatch": "0.2.14",
-        "nopt": "1.0.10",
-        "rimraf": "2.2.8",
-        "underscore.string": "2.2.1",
-        "which": "1.0.9"
+        "eventemitter2": "~0.4.13",
+        "exit": "~0.1.1",
+        "findup-sync": "~0.1.2",
+        "getobject": "~0.1.0",
+        "glob": "~3.1.21",
+        "grunt-legacy-log": "~0.1.0",
+        "grunt-legacy-util": "~0.2.0",
+        "hooker": "~0.2.3",
+        "iconv-lite": "~0.2.11",
+        "js-yaml": "~2.0.5",
+        "lodash": "~0.9.2",
+        "minimatch": "~0.2.12",
+        "nopt": "~1.0.10",
+        "rimraf": "~2.2.8",
+        "underscore.string": "~2.2.1",
+        "which": "~1.0.5"
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@@ -1919,9 +1920,9 @@
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           "dev": true,
           "requires": {
-            "graceful-fs": "1.2.3",
-            "inherits": "1.0.2",
-            "minimatch": "0.2.14"
+            "graceful-fs": "~1.2.0",
+            "inherits": "1",
+            "minimatch": "~0.2.11"
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@@ -1936,8 +1937,8 @@
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           "dev": true,
           "requires": {
-            "lru-cache": "2.7.3",
-            "sigmund": "1.0.1"
+            "lru-cache": "2",
+            "sigmund": "~1.0.0"
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@@ -1948,12 +1949,12 @@
       "integrity": "sha1-HTM8qYvaxEV29kbg1mgAh8v4xhU=",
       "dev": true,
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-        "browserify": "13.0.1",
-        "glob": "6.0.4",
-        "lodash": "3.10.1",
-        "resolve": "1.4.0",
-        "watchify": "3.9.0"
+        "async": "^1.5.0",
+        "browserify": "^13.0.0",
+        "glob": "^6.0.3",
+        "lodash": "^3.10.1",
+        "resolve": "^1.1.6",
+        "watchify": "^3.6.1"
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@@ -1968,11 +1969,11 @@
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           "dev": true,
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-            "inherits": "2.0.3",
-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "2 || 3",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
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@@ -1989,9 +1990,9 @@
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       "dev": true,
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-        "findup-sync": "0.3.0",
-        "nopt": "3.0.6",
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@@ -3977,12 +4014,21 @@
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-      "integrity": "sha1-8IH3bkyFcg5sN6X6ztc3FQ2EByo=",
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       "dev": true,
       "requires": {
-        "punycode": "1.4.1"
+        "psl": "^1.1.28",
+        "punycode": "^2.1.1"
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+      "dependencies": {
+        "punycode": {
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+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.1.1.tgz",
+          "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
+          "dev": true
+        }
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@@ -3997,15 +4043,14 @@
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       "dev": true,
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-        "safe-buffer": "5.1.1"
+        "safe-buffer": "^5.0.1"
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     "tweetnacl": {
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       "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
       "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
-      "dev": true,
-      "optional": true
+      "dev": true
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@@ -4043,6 +4088,23 @@
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       "dev": true
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+    "uri-js": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
+      "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
+      "dev": true,
+      "requires": {
+        "punycode": "^2.1.0"
+      },
+      "dependencies": {
+        "punycode": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.1.1.tgz",
+          "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
+          "dev": true
+        }
+      }
+    },
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       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/uri-path/-/uri-path-1.0.0.tgz",
@@ -4096,9 +4158,9 @@
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-      "integrity": "sha512-DIWtzUkw04M4k3bf1IcpS2tngXEL26YUD2M0tMDUpnUrz2hgzUBlD55a4FjdLGPvfHxS6uluGWvaVEqgBcVa+g==",
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
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@@ -4107,17 +4169,9 @@
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-          "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
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+        "extsprintf": "^1.2.0"
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@@ -4135,13 +4189,13 @@
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-        "chokidar": "1.7.0",
-        "defined": "1.0.0",
-        "outpipe": "1.1.1",
-        "through2": "2.0.3",
-        "xtend": "4.0.1"
+        "anymatch": "^1.3.0",
+        "browserify": "^14.0.0",
+        "chokidar": "^1.0.0",
+        "defined": "^1.0.0",
+        "outpipe": "^1.1.0",
+        "through2": "^2.0.0",
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@@ -4159,53 +4213,53 @@
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-            "timers-browserify": "1.4.2",
-            "tty-browserify": "0.0.0",
-            "url": "0.11.0",
-            "util": "0.10.3",
-            "vm-browserify": "0.0.4",
-            "xtend": "4.0.1"
+            "JSONStream": "^1.0.3",
+            "assert": "^1.4.0",
+            "browser-pack": "^6.0.1",
+            "browser-resolve": "^1.11.0",
+            "browserify-zlib": "~0.1.2",
+            "buffer": "^5.0.2",
+            "cached-path-relative": "^1.0.0",
+            "concat-stream": "~1.5.1",
+            "console-browserify": "^1.1.0",
+            "constants-browserify": "~1.0.0",
+            "crypto-browserify": "^3.0.0",
+            "defined": "^1.0.0",
+            "deps-sort": "^2.0.0",
+            "domain-browser": "~1.1.0",
+            "duplexer2": "~0.1.2",
+            "events": "~1.1.0",
+            "glob": "^7.1.0",
+            "has": "^1.0.0",
+            "htmlescape": "^1.1.0",
+            "https-browserify": "^1.0.0",
+            "inherits": "~2.0.1",
+            "insert-module-globals": "^7.0.0",
+            "labeled-stream-splicer": "^2.0.0",
+            "module-deps": "^4.0.8",
+            "os-browserify": "~0.1.1",
+            "parents": "^1.0.1",
+            "path-browserify": "~0.0.0",
+            "process": "~0.11.0",
+            "punycode": "^1.3.2",
+            "querystring-es3": "~0.2.0",
+            "read-only-stream": "^2.0.0",
+            "readable-stream": "^2.0.2",
+            "resolve": "^1.1.4",
+            "shasum": "^1.0.0",
+            "shell-quote": "^1.6.1",
+            "stream-browserify": "^2.0.0",
+            "stream-http": "^2.0.0",
+            "string_decoder": "~1.0.0",
+            "subarg": "^1.0.0",
+            "syntax-error": "^1.1.1",
+            "through2": "^2.0.0",
+            "timers-browserify": "^1.0.1",
+            "tty-browserify": "~0.0.0",
+            "url": "~0.11.0",
+            "util": "~0.10.1",
+            "vm-browserify": "~0.0.1",
+            "xtend": "^4.0.0"
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@@ -4214,8 +4268,8 @@
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           "dev": true,
           "requires": {
-            "base64-js": "1.2.1",
-            "ieee754": "1.1.8"
+            "base64-js": "^1.0.2",
+            "ieee754": "^1.1.4"
           }
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         "glob": {
@@ -4224,12 +4278,12 @@
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           "dev": true,
           "requires": {
-            "fs.realpath": "1.0.0",
-            "inflight": "1.0.6",
-            "inherits": "2.0.3",
-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
           }
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@@ -4244,7 +4298,7 @@
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           "dev": true,
           "requires": {
-            "safe-buffer": "5.1.1"
+            "safe-buffer": "~5.1.0"
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@@ -4255,12 +4309,12 @@
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-        "readable-stream": "2.3.6",
-        "safe-buffer": "5.1.2",
-        "ws": "3.3.3",
-        "xtend": "4.0.1"
+        "duplexify": "^3.5.1",
+        "inherits": "^2.0.1",
+        "readable-stream": "^2.3.3",
+        "safe-buffer": "^5.1.2",
+        "ws": "^3.2.0",
+        "xtend": "^4.0.0"
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@@ -4295,9 +4349,9 @@
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       "dev": true,
       "requires": {
-        "async-limiter": "1.0.0",
-        "safe-buffer": "5.1.1",
-        "ultron": "1.1.1"
+        "async-limiter": "~1.0.0",
+        "safe-buffer": "~5.1.0",
+        "ultron": "~1.1.0"
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     "xtend": {
diff --git a/package.json b/package.json
index a049c163..5a90352c 100644
--- a/package.json
+++ b/package.json
@@ -39,25 +39,26 @@
     "inflate"
   ],
   "devDependencies": {
-    "browserify": "~13.0.0",
-    "grunt": "~0.4.1",
-    "grunt-browserify": "~5.0.0",
-    "grunt-cli": "~1.1.0",
-    "grunt-contrib-connect": "~2.0.0",
-    "grunt-contrib-jshint": "~1.0.0",
-    "grunt-contrib-uglify": "~4.0.1",
+    "browserify": "^13.0.0",
+    "grunt": "^0.4.1",
+    "grunt-browserify": "^5.0.0",
+    "grunt-cli": "^1.1.0",
+    "grunt-contrib-connect": "^2.0.0",
+    "grunt-contrib-jshint": "^1.0.0",
+    "grunt-contrib-uglify": "^4.0.1",
+    "grunt-extract-sourcemap": "^0.1.19",
     "grunt-saucelabs": "Stuk/grunt-saucelabs#v10.0.0",
-    "jshint": "~2.9.1",
-    "jszip-utils": "~0.0.2",
+    "jshint": "^2.9.1",
+    "jszip-utils": "^0.0.2",
     "package-json-versionify": "1.0.2",
-    "qunit": "~2.9.2",
+    "qunit": "^2.9.2",
     "tmp": "0.0.28"
   },
   "dependencies": {
-    "lie": "~3.3.0",
-    "pako": "~1.0.2",
-    "readable-stream": "~2.3.6",
-    "set-immediate-shim": "~1.0.1"
+    "lie": "^3.3.0",
+    "pako": "^1.0.2",
+    "readable-stream": "^2.3.6",
+    "set-immediate-shim": "^1.0.1"
   },
   "license": "(MIT OR GPL-3.0)"
 }