If the template is marked as priority the notification will be sent using the `notify` queue.
The `notify` queue is a low volume queue, messages here will not be queue behind a large job and should be delivered with in a more consistent time frame.
- Added templates.process_type and templates_history.process_type column.
- Added a template_process_type table to handle the enum for templates.process_type, initial values are normal and priority
https://www.pivotaltracker.com/story/show/135429147