Improved direct messaging experience

[madduck]

At the moment, if I want to directly message a user, I need to wait for a room to be created, and joined. This only takes a few seconds, but it's long enough to make me wonder why we impose this on users. I'd say that a good UI should throw the user right into a room and let them start typing, and connect the threads in the background, caching messages until the room is ready. All this should happen without the user even knowing.