Moved the pinger to the start of the connection

This is because some IRC clients get upset when you don't do this.
This can also stop attacks against the server by just opening and
then going away, hanging the server up.

I mean, sure there are many ways to attack TwIRC, but its best to kill
the low hanging fruits.
Fixed consistancy issues with the SYS user PM'ing the client

The only thing now that should trigger a PM from SYS is to auth againt
twitter itself, nothing else should be done as a PM.