Initial implementation.
Add some more test helpers.
Fix .get_batch_key().
Tests for new message storing middlewares.
Remove get_batch_key in favour of get_latest_batch_key.
Remove stray additions.
Fix up examples in ContactsResource docstrings
Merge branch 'develop' of github.com:praekelt/vumi-go into develop
Fix error message text in .get_batch_id() NotImplementedError.
Comment on why MessageMetadataHelper is imported inside a method.
Merge branch 'feature/issue-599-conversation-and-router-message-storing-middleware' into develop
Start and stop routers.
Merge branch 'develop' into develop-frontend
Merge branch 'feature/issue-605-start-stop-routers' into feature/issue-606-router-lifecycle-ui
Router lifecycle UI.
Merge branch 'develop' into develop-frontend
Merge branch 'feature/issue-606-router-lifecycle-ui' into develop-frontend
Only running conversations and routers process messages.
Restructure things to allow more kinds of migrations.
Remove hackery from #605.