general idea:

users will be able to have and set nicknames
a user's nickname will store in the browser using persistence.js
the user's nickname should probably just be in socket.data.nickname
on connection, the web UI will tell the server "this is my nickname"
- completely enforced by the web UI
replace any place in the web UI that shows a socket ID with the nickname
list of users and nicknames will be sent in the session data to web clients
- this will be used in the future for a user list and chat