Websocket API

[cpfiffer]

Need to be able to send stuff over websockets. This might be a good candidate for the beta but not the alpha, since websockets are kinda hard and will require some structural changes.

The way I want to use websockets:

• Handle live and shared streams. Users should all be able to subscribe to the same websocket so that they can collaboratively edit the brain buffer in real time. Similarly, if a user is on the live feed, they should be able to watch a stream of live thoughts autoscroll.
• Send misc thoughts from cominds to the user asynchronously, i.e. thoughts on the user's current context, etc.
• Notifications. Currently we can do this via REST with a timer or something, but it'd be nice to be able to make things a little more robust.