Rename files to match naming conventions

Thanks for creating this generator!  This is the configuration that I like, but you have a slight issue with your file naming, if you want to be consistent with the Google recommended Angular structure.  The file names should use hyphens instead of underscores (except for test files).

So "main_controller.js" should be "main-controller.js" and "main-controller_test.js".

I updated the file names -- content is all the same.