There is no need to load all comments only to count them. Lets just let
the database do all the work. If there are no comments found, nothing
will happen anyway.
Also already filter the comments to only search for notifications for
own comments.
And add some tests :)
updated_at is displayed in the frontend and should only be updated when
another notification_actor gets added
Also improved the sql-queries: update directly and not select first and
update then.
* move presenters back to controllers, this is view-logic
* use PostService in CommentService
* remove iframe route, this is not used anymore
* id/guid limit at 16 chars, hex(8) is 16 chars long