refactor(attributes): remove unneeded escapes (#1635)

Author: XhmikosR

lib/api/attributes.js

@@ -23,7 +23,7 @@ var primitives = {
 // Attributes that are booleans
 var rboolean = /^(?:autofocus|autoplay|async|checked|controls|defer|disabled|hidden|loop|multiple|open|readonly|required|scoped|selected)$/i;
 // Matches strings that look like JSON objects or arrays
-var rbrace = /^(?:\{[\w\W]*\}|\[[\w\W]*\])$/;
+var rbrace = /^(?:{[\w\W]*}|\[[\w\W]*])$/;
 
 /**
  * Gets a node's attribute. For boolean attributes, it will return the value's