Moving to the VS JS extensibility model, removing the "global modules requirement"

Refactored the extension so that it works with the Visual Studio JavaScript editor's native extensibility model - renaming the extension to angular.intellisense.js. Now, if the file is placed next to angular.js in the project, it will automatically be loaded right after Angular library. 

Other bug fixes made: 

1. Modules no longer need to be exported to global 
2. The implicit "ng" module is now required by default for all modules - the same as Angular's runtime behavior 
3. Required modules are respected correctly when editing the first file in which a module is defined 
4. Expanded test cases