Server doesn't pass $scope to getAccessTokenData().

OAuth2_Controller_AccessController::getAccessTokenData receives a scope parameter, but it is not passed by the server, and it is not present in the interface.

I find it useful, and because it is not passed, I've had to duplicate the scope check outside of the library (in the Drupal integration code). 
Allowing the server to pass $scope along will allow me to remove that duplication.