Status is an association on tasks
Rewrite accessed by scope test to use factory girl
Remove the duplicate AbstractTask#status_name
TaskFilter build status filter by the status id
Status select field selects for the status_id
Status if required attribute of the task, but it could be nil on initialization
Fix typo in Status.default_closed
Fix Mailman tests
Fix unit/task_test
Fix TaskTemplatesControllerTest
Remove TasksController#set_group and TaskRecord#update_group
Fix TasksControllerTest
Fix TaskEditTest