Fix in/not_in query args, deprecate record_after, add date_after/date_before args
Add unread count user option and functionality for current users
Properly save user meta for unread count option
Fix a few bugs occurring when users have opted out
Use existing list table query to reset last read user meta
Better targeting of update bubble with JS to remove
Merge develop into issue-588
Use empty for simplicity
Set transient instead of delete, delete only on user delete
Allow optional param for unread_enabled_for_user
Merge pull request #658 from wp-stream/issue-588

Display unread count badge in menu specific to the current user