Support $inject in angular plugin

[keirlawson]

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This doesn't seem to be supported by Tern's AngularJS plugin, however it is now the recommended way to do dependency injection in Angular 1.x

[jonyeezs]

+1 I use alot of John Papa's style guide where he recommends to use $inject.

I can't see anywhere in the plugin that refers to this.

I would love to contribute, but i'm not sure how to follow through the code.