use node event system

[tommedema]

Instead of everyone.connected(function() { }); use the node event system so that people can do everyone.on('connected') etc.

This has several advantages:

- consistent with node style

- allows unregistering event listeners

- allows multiple listeners

[ericz]

The server already uses the node eventemitter system.

.connected is simply an alias for .on('connect'

They are the same. See the bottom of: http://nowjs.com/doc

[tommedema]

Great. Thanks.