set backend_name attribute to None by default
add vumi backend
Merge branch 'feature/new-routing' of github.com:rapidsms/rapidsms into feature/vumi-backend
fix message keys per convo with Simon; add outgoing module; add more tests
Merge branch 'feature/new-routing' into feature/vumi-backend
fix variable names
catch errors in Backend.send
set msg sent properly
Merge branch 'feature/new-routing' into feature/vumi-backend
Merge branch 'feature/new-routing' into feature/vumi-backend
fix vumi keys to to_addr and from_addr
Merge branch 'feature/new-routing' into feature/vumi-backend
Merge branch 'feature/new-routing' into feature/vumi-backend
capture most of vumi's context
Merge branch 'master' into feature/vumi-backend

Conflicts:
	lib/rapidsms/router/blocking.py
	rapidsms/backends/http/views.py
don't restore old blocking router
starting to work in multiple connections
Merge branch 'pep8-compliance' into feature/bulk-messaging-api

Conflicts:
	rapidsms/messages/outgoing.py
begin to refactor base message class; fix related tests
remove translation logic from message objects (to be handled by user)