Allow users to mention one or more friends to start a group chat
Update "Seen by" feature to work with group chat
Merge branch 'feature/group_chat' into develop
Bugfix: Unread messages in group chats cause Notification Center shows "Loading…" forever
Allow user to turn off email notifications
Bugfix: chatbox status area does not move when compose box height is changed
Bugfix: gender of user displays incorrectly in some places
Allow admins to manage group membership
Bugfix: In Group Members page, user should not see "Make Admin" & "Remove Member" buttons if they don't have the permission.
Fix some small bugs
[Notes] Bugfix: next pages do not load properly
Bugfix: chat close button sometimes does not work properly
Show unread chat messages in Notification Center on page reload
Only blinking chat window if it has unread messages
Remove all system messages without comments from News Feed
Remember chatbox state (expand or collapse) when page reload
Bugfix: Seen by & typing status not working properly in group chat
Bugfix: Can't upload files (using upload button on chatbox title bar)
add cherrypy to requirements
Bugfix: can't start chat with new users