Update IRC logging to be more idiomatic

Based on a message from kini on #oplss at 2013-07-27 12:40:
   freenode / #oplss / kini  2013-07-27 12:40  (kini!kini@unaffiliated/kini)
       jgross: the standard format is "[timestamp] <username> message", one line per message
   freenode / #oplss / kini  2013-07-27 12:41  (kini!kini@unaffiliated/kini)
       non-message events are usually notated as "* event description", e.g. "* kini (unaffiliated/kini) joined
       #oplss", or whatever