Minimally invasive change to put logging behind a user-replaceable interface.

This could probably be done better, and there are probably awful caveats
and hidden gotchas with this approach. I REGRET NOTHING.
Simple adapter to utilise GLog with goirc.
Split handlers up into three groups.
Use a single control chan to kill mockNetConn goroutines (77->54).
Wait for all goroutines before calling initialise (54->10).
Put read lock in Connected() (10->9).
Use call checker instead of writing to shared var in tests (10->1).
Atomic incrementing of call count for dispatch test (1->0).

This probably could be done better with channels...
Add LICENSE file lifted from Go to back up README.