Release 1.2.0

Thanks to @giftig and @lukewaite for the improvements!

* Many matchers have been cleaned up to be slightly more restrictive
* Add a KHAAAAAAAAAAAN command
* Add bad joke eel
* You can new extend memes in your own bot by `require`ing
	`lib/memecaptain.coffee`
* Add matcher ids to be useful to new scripts which use middleware.