Removing oauth_provider v1.0 because of a few changes more in the engine
Plugging in #gocd datastore into the oauth2_provider engine.

Added a rails extension to set the datasource as OauthRepository and configure oauth2_provider configuration values
Changing views to accomodate the new engine

Changing #gocd layouts, views and headers to use oauth2_provider routes from engine. Also made an application_controller method used by the engine as a :helper_method