Fix-up outbound resource and add tests for new methods.
Add docstrings.
Better parameter checking.
Change a ContactsResource docstring (null instead of None)
Better search enablement handling in contact tests. (justinvdm, Hodgestar)
Merge branch 'develop' of github.com:praekelt/vumi-go into develop
Factor out sending failures a bit.
Use _mkfail for errback too.
Add support for null content in replies.
Merge branch 'develop' into feature/issue-420-fix-up-outbound-resource
Merge branch 'feature/issue-420-fix-up-outbound-resource' into develop
Merge branch 'develop' into develop-frontend
Merge branch 'develop-frontend' into feature/VUMIGO-202-integrate-base-template
Fix account tests
Merge branch 'feature/VUMIGO-202-integrate-base-template' of github.com:praekelt/vumi-go into feature/VUMIGO-202-integrate-base-template