Corrects JOIN logging, which didn't check whether the message was for us
or another user. Fixes that saveBackup was run more frequently each time
a user entered the room, or we reconnected.

Adds log events for IRC kicks and connections, so we'll know if it's had
any trouble. (Unfortunately this IRC library doesn't seem to have any
explicit 'disconnect' events, so we can't collect data on that beyond
knowing when it reconnects.)
Merge pull request #24 from jeremybanks/irc-logging-fix

Corrects JOIN logging, which didn't check whether the message was for us