** Added entities for forum and forum topic followers
** Added event for forum post create
** Added forum post create event launching 
** Added listener for forum post event (not doing anything yet)
** Removed unused ForumFollower
** Renamed ForumTopicFollower -> ForumTopicWatcher
** Added method for TopicWatchers into ForumController
** Added link to start watching topics
** Implemented watch / stop watching link functionality in forum topic
view
** Added forum post notification mailer
** Changed createTopic and createForumPost methods of ForumController to
add creating / posting user as a watcher for the topic