* due to the blocking nature of channel reads, by the time the runLoop()
for loop exits in that goroutine, we might well be half-way through
reconnecting to the server -- a bad time to run conn.initialise().
move the call to initialise() into shutdown() to ensure it happens
in a timely manner.
* On a related note, conn.Me was retaining old channel objects in it's
Channels map. All other references to nicks and channels are erased
in conn.initialise(), but as we keep a seperate reference to our Nick
object in conn.Me, we need to reinit that at the same time.