Removed superfluous methods that were not being used.
Commented out all the migration code. It had no tests and worked/failed randomly. Starting over with TDD :).
Added a courier layer over the CoreData::StoreCoordinator, allowing courier to sandbox itself in app/documents/courier/**/*. Courier::nuke.everything.right.now now empties only the courier directory.
Fixed an incorrect test name to better represent the purpose of the test.