Remove unnecessary VumiApi methods.
Merge branch 'develop' into feature/issue-581-conv-and-router-batches-at-creation
Create batch for new conversation, update it for old-style start.
Merge branch 'develop' into feature/issue-581-conv-and-router-batches-at-creation
Add tags to batches when acquiring.
Test tag batches.
Batch for router.
Explanatory comment.
Rename some tests.
Simplify unnecessary tests.
Merge branch 'feature/issue-581-conv-and-router-batches-at-creation' into develop