Rearchitect BotWorker to use message processors in a single worker instead of multiple workers with custom queues.
Convert coffee to message processor and add test helper.
Update github module.
Update memo module.
Update mexican module.
Update misc module.
Remove timetracker module. It uses obsolete vumi functionality that has no modern equivalent and we no longer need it.
Merge branch 'feature/issue-19-update-to-work-with-recent-vumi' into develop