Gentoo is forced to use old interface naming convention -- Vagrant only supports the newer naming convention for operating systems that identify themselves as either Redhat or CentOS.
Correction to allow root to SSH to the gentoo live CD -- root SSH access had changed to be disabled by default on the live CD.
Grub timeout is now correctly set.
Optional logic for loading the stage3 and portage files from a supplied tar file -- a huge timesaver when you have to run these scripts over and over again to fix the problems.