sussbot and all of the IRC-related code in this homework are based on the
ircbot-collection package, by Ben Collins-Sussman et al.

It was modified slightly to run on Python 3, and to make the use of IRC-server
passwords easier, by Alex Rudnick.

ircbot-collection code is released under the GPL v2.
http://www.gnu.org/licenses/old-licenses/gpl-2.0.html

... except for irclib.py and ircbot.py, which are released under the LGPL (see
their text).
