New UI for the Messages page
Allow users to rename the title of group chats
Bugfix: sometimes fails to open a chat
Bugfix: Upload button does not work in extended chat
Put quotes around the topic name
Do not show HTML code in notification messages
Bugfix: New comment getting submitted twice
Expanded Chat right sidebar: update unread counter & last message in real time
Bugfix: (Expanded Chat compose box) mentioned users' background color not showing up
Chatbox: clear compose box when chat message arrives
Switch from gravatar https link to http for faster page load
Chatbox: Add "Load Earlier Messages" link
Chatbox: show username on mouse over avatar
Expanded chatbox: Display thumbnails of attached images
Expanded Chatbox: Add avatar of user/group to chatbox header
Chatbox: Automatically guess and highlight code snippets
Bugfix: Seen by, upload progress, type status disappear in expanded chatbox
Expanded Chatbox: Scroll unread chat into view
Dynamically change expanded chatbox height based on browser window
Redesign expanded chatbox header

- Two-line heading (title & description)
- Add an option that allow user to see topic members list
- Remove "Toggle Minimize" mouseover popup