Auth Adapters refactoring (#3177)

* 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

spec/TwitterAuth.spec.js

@@ -1,4 +1,4 @@
-let twitter = require('../src/authDataManager/twitter');
+let twitter = require('../src/Adapters/Auth/twitter');
 
 describe('Twitter Auth', () => {
   it('should use the proper configuration', () => {