renamed client.js to pn.js
Add socket.io dep, removed useless button from the interface
add socket.io + redis store base ; use the cluster module
Instable state -> successfully moved the save and load to socket.io
fix a mistake that causes multiple initialization on the client side
handle basic join/leave rom on note
Socket IO now implemented
turn PN, the main js object, into a proper one
oups, forgot a this
update readme and todo