kike: add a `ping_interval' config. value
kike: implement the ping-pong and QUIT
kike: implement connection limit

Somehow I'm not sure whether this thing is useful in any sense.
coin: wrap an if statement
kike: implement clean shutdown
kike: implement PRIVMSG to user
kike: update the poller properly

Now we can send PRIVMSG's between users and all that jazz.