Added NEWS file to track changes made in each release.
Don't pause rendering bad chatroom route.

At least show the chat rooms pane, so that the user can
select a proper chatroom.
Show 'notFound' template in chat page when no room is selected.
Show 'notFound' page when an invalid route is visited.
Don't show 'notFound' template during initial load of a chatroom.
Fix min height of drawer for small screens.
Allow customizing mongodb setup using inventory variables.