* Refactor all auth adapters to reduce duplications
* Adds mocking and proper testing for all auth adapters
* Proper testing of the google auth adapter
* noit
* Moves all authentication providers to Adapter/Auth
* refactors specs
* Deprecates oauth option in favor of auth option
- Deprecates facebookAppIds option (in favor of auth.facebook.appIds)
- Adds warnings about the deprecated options
* nits
