Create refresh token model. This model holds information about refresh token of the application.
Added send_refresh_token_to_app method to Authenticator lib.
Added update action to authorize controller. It stores refresh token for allowed apps.

Conflicts:
	app/models/dauth/refresh_token.rb
Added dauth/thirdparty_app model. The model holds information of allowed apps. Implemented a has_many relation with refresh_token model.
Third party apps are saved when authorized by the user.
Added dauth/thirdparty_app controller and views. User can view and revoke allowed apps.