adding a name property to the PersistantBackend. adding a method to the router to get a backend by name
adding a name property to the PersistantBackend.
adding a method to the router to get a backend by name

rapidsms/rapidsms-contrib-apps-dev,dimagi/rapidsms-contrib-apps-dev,dimagi/rapidsms-contrib-apps-dev,rapidsms/rapidsms-contrib-apps-dev