sendchat()
relaying messages works

JSON vs text is kind of sketchy
also the demo wants to be able to enforce some metadata: your username
and the backend doesn't support that (in fact, in the base case, can't)
..maybe that's for the best? maybe the chatroom demo should be a demo subclassing PubSubBroker?
Chatroom demo works. Now, needs some CSS wizardry.

HAH TAKE THAT AUTOBAHN