Message hiding listens for edit action messages

Message hiding is now realtime, when a room admin hides a message, the
hidden message is immediately reflected on the DOM of other users.
Earlier, users had to reload page to see the hide/unhide properties reflected

Also removed the top border from the menu.
Merge branch 'staging' of http://github.com/scrollback/scrollback into staging

Conflicts:
	public/sdk/factory.js
	public/sdk/viewcontroller.js