Change the Http backend to use the new Receiver API.
Change the Http backend to use the new Receiver API.

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