Cleanup of IntelliSense and Go To Definition Behavior

In this pull request I'm submitting a couple changes to cleanup IntelliSense and make features like Go To Definition work correctly.
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Changed the AngularJS_VisualStudio_Intellisense so that it is always hidden from IntelliSense (using the _$ prefix).

Resetting the "definitions" for angular.module and angular.forEach back to their original functions, usning intellisense.redirectDefinition - this doesn't alter the behavior of the extension, but enables features like Go To Definition to work correctly.