Added gamecd/conf option to livecd_stage2_target.py, added gamecd.conf.example to...

Added gamecd/conf option to livecd_stage2_target.py, added gamecd.conf.example to /examples, cleaned up game-specific code in gamecdfs-update.sh to make it more generic, added more fundtionality to livecdfs-update.sh and default-runscript.sh for gentoo-release-environmental and gentoo-gamecd to make spec files simpler and to remove the need for specifying a gamecd/environmental fsscript in livecd/fsscript, allowing the user to still use a custom fsscript of their own.

git-svn-id: svn+ssh://svn.gentoo.org/var/svnroot/catalyst/trunk@497 d1e1f19c-881f-0410-ab34-b69fee027534