Move the configuration example over to a wiki page.
So.. I needed to reproduce a traceback while testing an addition.

Adds a module that adds the `forceexception` command, to reproduce a traceback.
Adds a debug channel for the bot.

Configuration item added: `debug_chan`
The debug channel (for now) only posts tracebacks when they occur.

Improve traceback system, allow bot for more proper shutdowns.
The bot can now properly shutdown, instead of raising a KeyboardInterrupt.
entertainment.py now uses the configuration for the rate limitation in seconds.