kcar 0.5.0 - GPL-2.0+, new mailing list, doc updates

kcar 0.5.0 - GPL-2.0+, new mailing list, doc updates

An "or later" clause has been added for GPL-2.0 users,
the Ruby 1.8 license is still an option, of course.

There's a new, open-to-all (except HTML senders :P) mailing list at:

	kcar-public@bogomips.org

Existing librelist users will need to resubscribe themselves, as there's
no way for me to do it.  Users who wish to subscribe may send a message
to:

	kcar-public+subscribe@bogomips.org

Similarly, they may unsubscribe via:

	kcar-public+unsubscribe@bogomips.org

HTTP archives are available via:

	http://bogomips.org/kcar-public/

The documentation is updated to reflect this and the website
loads faster thanks to the switch to olddoc.

shortlog:
      Rakefile: kill raa_update task
      license: upgrade from GPLv2-only to GPLv2-or-later
      switch documentation to olddoc
      change mailing list to kcar-public@bogomips.org
      response: fix mispelling of "guarantee"
      README: update support status to Ruby 1.9+
      continue generating VERSION constant
      kcar.rl: remove unused REASON length check