Move websocket stuff to api.push
WIP subscriptions
Can toggle subscriptions on threads
Draft of notifiers and NotificationCoordinators
WIP: Each Notifier takes the subject, start using for posts controller
Fix bugs in notification coordinator dedup logic
Replace notification controller concerns with notifiers
Remove todos in comment
Send an email to thread subscribers when a new post is made
Can subscribe to subforums and get emails for new threads
Include the resource name in subscription reasons
Add user settings for auto-subscribing
Fix typo
Simplify subscription emails
Auto-subscribe users who are `@mentioned`
Auto-subscribe thread creators
Remove print
Spacing
Better query
Code golf