added pydoc to KeywordHandler.
added pydoc to KeywordHandler.

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