Add format and stderr options to Logger() to make it more configurable and easier to test.
Add format and stderr options to Logger() to make it more configurable
and easier to test.

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