Gentoo Chroot

I've created a package called Gentoo Chroot, which is based on the existing Debian Chroot package.

Builds succeed for all architectures defined in the `Makefile`. However, I only have a DS214play (`evansport`) available to test on, so I'm not sure if this installs/runs on other architectures.

I've squashed down all my commits to 7 major changes, which I hope helps.