Also move "shareable hidden"-logic to AlsoCommented, because it is the
only one that needs it. And write some specs for mentioned and started
sharing notifications.

Fixes #6294

And remove the note_html property from the model.

Marking a notification as unread resets the timeago stamp causing
the times to look wrong. It can be reproduced by marking an old
notification as unread. Using the update_column instead of
update_attribute will not touch the updated_at attribute, and
thus will not affect the updated time ago in the view.

Fixes #6798.

closes #6821

closes #6573

closes #6512

commit. Add migration and rake task to copy hidden information from
share_visibilities to users. see: http://devblog.joindiaspora.com/?p=44

we find a better way to reimpliment it in a  more sane way

This reverts commit 655558cb.

Revert "MS DG; for real this time?"

This reverts commit f85a047f.

Revert "MS DG; actually fix the bug"

This reverts commit cde12ec2.

Revert "fix small commenting email bug #oops"

This reverts commit a552fc80.

Revert "dont ban diasporahq  stuff"

This reverts commit 2c12b94e.

Revert "Merge branch 'participants'"

This reverts commit 74178018, reversing
changes made to abd211ba.

one place; restore listening to single process mode in resque; move the
exception handling to inside the method, rather than around the
intializer, and log when resque errors happen in development in single
process mode

attempt to add muting of notifications when post has a hidden visibility; i am getting a load path error in resque now, but that seems to be independent of this commit

fixed the problem where notifications are not keeping track of the target id as well as making notifications for a mention be destroyed when a post is