[Fedora-livecd-list] Refactoring livecd-creator and providing an API

[Mark McLoughlin]

Hey,
	I've taken Jeremy's repo and done further re-factoring, mostly with the
aim of cleaning up the sub-classing API and making it a lot more clear
what is and isn't part of the API.

	I think the whole codebase is much cleaner now, though, and I've even
added docs ! :-)

	Please take a look at:

  http://markmc.fedorapeople.org/git/livecd-tools.git

	Comments are very welcome - e.g. what's exposed in the sub-classing API
might be a little conservative right now.

Cheers,
Mark.