Don't truncate messages so much.

Increase message length limit to 2048 characters; also
explicitly exempt messageAddInfo from truncating.
We were running into the length limit with the user list
in /who due to the lengthy HTML code.
Use xmpp.jidFromRoomNick in xmpp.iq.
Addon to #102: Remove connection on discconnect.

Attempting to disconnect a connection object that isn't properly
connected may cause errors. After disconnecting, the connection
object should be removed completely.
Addon to #30: Send configuration to the right room.

xmpp.configureRoom ignored the room parameter and simply
configured xmpp.room.current.