yeah - recall my comments about not having status codes in the model layer. What would you like to see here? In the docs: ```http://api.openstack.org/api-ref-identity.html#os-ksadm-admin-ext``` the API call ```v2.0/users/​{userId}​/roles/OS-KSADM/​{roleId}​``` doesn't return anything in the response. Should we just automatically return true and assume a bad response will throw an exception? Not sure that's a safe approach...