Added cat butt.
Adding mongo to the stack and also patching a weird error that randomly started happening.
Adding users.  Automatic account creation if not logged in, displays who you are on the frontend, and also displays who else is using the whiteboard.
Removes you from the visible list if you close the tab, but something about it is wonky.
Adding separate boards/sessions and automatically generating new ones if you hit the base URL.

All this user and board stuff is super messy right now, and incredibly buggy.  I'll clean it up later once things start finalizing and coming together.