added app_conf helper to rapidsms.config
added app_conf helper to rapidsms.config

to help WebUIs get access to their apps configuration, whether it be
the defaults (from config.py and App.configure), or explicitly defined
in rapidsms.ini -- this is just until we rejig the configuration...

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