added _stop_all_apps hook to router.
added _stop_all_apps hook to router.

eHealthAfrica/rapidsms,caktus/rapidsms,eHealthAfrica/rapidsms,lsgunth/rapidsms,eHealthAfrica/rapidsms,catalpainternational/rapidsms,catalpainternational/rapidsms,unicefuganda/edtrac,rapidsms/rapidsms-core-dev,ehealthafrica-ci/rapidsms,ken-muturi/rapidsms,lsgunth/rapidsms,caktus/rapidsms,unicefuganda/edtrac,lsgunth/rapidsms,peterayeni/rapidsms,dimagi/rapidsms,ken-muturi/rapidsms,ken-muturi/rapidsms,ehealthafrica-ci/rapidsms,peterayeni/rapidsms,lsgunth/rapidsms,dimagi/rapidsms-core-dev,unicefuganda/edtrac,peterayeni/rapidsms,dimagi/rapidsms-core-dev,catalpainternational/rapidsms,peterayeni/rapidsms,dimagi/rapidsms,caktus/rapidsms,rapidsms/rapidsms-core-dev,catalpainternational/rapidsms,ehealthafrica-ci/rapidsms