updates to bot.js to support running under #qa channel with occasional test day events

I've been testing this on #testdaybotTest running on irc.mozilla.org. 
Enter :help for general help or /msg _TestDayBot :admin (testDayAdmins only: ashughes, whimboo, galgeek for now) for test day admin help.
stats for now print to the console.
galgeek wrote on 12/17/2014 08:18 AM:

> My impression is that only channel ops and admins can set the topic. Is
> that correct?
> 
> And if so, will all day Test Day admins have that privilege?

Admins for the testday bot can request that, yes. They don't necessarily
need OP permissions in the channel. Also the topic should also be
changed when a testday starts and ends.

-- 
Henrik Skupin
Senior Test Engineer
Mozilla Corporation