Example config and requirements updated

I added a sample config file (it assumes configobj), and updated
requirements to include that project, pytz, dateutil, tzlocal, and
natural.  I can't think of any project that don't deal with time, and
you need these modules to do that right
Purged example code from repo.

it was just http://bit.ly/ircbot anyways, if you want to see it.
Added a chatlog module

This module is not finished, it still needs the formatters for the
various event types, but the scaffold is there to do logging in a
semi-sane way (read that as "I looked at what irssi did with file
descriptors and think i managed to do the same.")

Trit, I beat you.