added templates for inactive draft notification
now inactive_drafts scope returns only projects without the notification, this should make our notification worker work a lot less
implemented method to send inactive_drafts notifications in project model [fix #64403468]
Merge branch 'master' of github.com:catarse/catarse into inactive_draft_notification
updating gems to fix dependencies issue
replacing thread_safe version
Merge pull request #614 from diogob/inactive_draft_notification

Inactive draft notification