Add irc.names event

[lejeunerenard]

It might be nice for components to know when Haxfred updates his Haxfred.irc.users object.

They could add a listener to Haxfred.irc.client but that seems silly since we want to sugar coat things for components as much as possible. If a component author wants to have that low level control, they can add a listener to Haxfred.irc.client instead of using the irc.names event.