* Use the correct function when validating google auth tokens
httpsRequest.request expects the param postData and has no default value
or validation to check if it is missing before using it. As a result, an
error `TypeError: First argument must be a string or Buffer` is
thrown when an attempt is made to authenticate with Google.
A quick check on the LinkedIn, FB, and twitter authentication adapters
shows they are using httpsRequest.get for their validation calls.
* Correct google auth adapter tests
* 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
