minor #236 remove pre-configured platform PHP version (xabbuh)

This PR was merged into the 1.0-dev branch.

Discussion
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remove pre-configured platform PHP version

This resolves #234.

Commits
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be7d2dd remove pre-configured platform PHP version

Author: javiereguiluz

src/Symfony/Installer/NewCommand.php

@@ -350,6 +350,18 @@ protected function updateComposerJson()
             unset($contents['description']);
         }
 
+        if (isset($contents['config']['platform']['php'])) {
+            unset($contents['config']['platform']['php']);
+
+            if (empty($contents['config']['platform'])) {
+                unset($contents['config']['platform']);
+            }
+
+            if (empty($contents['config'])) {
+                unset($contents['config']);
+            }
+        }
+
         if (isset($contents['extra']['branch-alias'])) {
             unset($contents['extra']['branch-alias']);
         }