Added an auth solution for websockets

Until we figure out how to intercept the HTTP get request that is upgraded into a websocket, we will be using a token-based system to indicate that a websocket can be trusted. Anyone can open a websocket with the server with this approach, but only authenticated users will be able to get a token allowing them to use it.
These lines feel more complicated than they need to be.  Why not just check if `req.session.sessionId` is there, if not, generate it, then assign to `sessionId`?