contact_key -> key
update_extra, update_subscription -> update_extras, update_subscriptions
Update docstrings for update_extras and update_subscription
Add contact field to all contact resource api method replies
Create routing table entries when passing a batch_id to ConversationWrapper.start().
Merge branch 'develop' into feature/issue-253-contacts-resource-api-needs-fixing
Merge branch 'feature/issue-253-contacts-resource-api-needs-fixing' into develop
Merge branch 'feature/issue-254-fix-confirm-start-routing' into develop
Merge branch 'develop' into develop-frontend