Use kernel 3.9.x on the CD due to logitech breakage in 3.10.x.

It seems that support for Logitech wireless keyboards is broken in
kernel 3.10.x.  I have one of those!  So I'll use a 3.9.x kernel on
this CD until the problem is resolved.
Rework live CD sound scripts.

This is just a refactoring for the moment.
A "sound card chooser" script is in the works, for people who have
multiple sound cards on boot.  See the post about HDMI audio and
TalkingArch on my blog at http://the-brannons.com/tarchblog/

Note that the master branch may be broken right now.