Tweak JSHint and JSCS checks.

Be more consistent across the whole codebase.

Also, make use of JSHint's 2.5.1 `extends` and `qunit` options. This way we set our basis options in js/.jshintrc and override the rest.

js/tests/unit/.jshintrc

@@ -0,0 +1,5 @@
+{
+  "extends" : "../../.jshintrc",
+  "devel"   : true,
+  "qunit"   : true
+}

js/tests/unit/phantom.js

@@ -6,7 +6,6 @@
  * Licensed under the MIT license.
  */
 
-/*global QUnit:true, alert:true*/
 (function () {
   'use strict';