Updates and fixes for Gentoo latest (stage3-20131010-amd64)

 Templates for gentoo-latest-xxx are broken against current latest (at least against 2013-10-08, 2013-10-10 and 2013-10-22 snapshot) with VirtualBox 4.3.0. I had to modify it and build again quite a bit... This is an update for gentoo-latest-amd64 only. Another changes on gentoo-latest-i686 template will be made after this one.

Updates,Fixes

* Kernel based on 3.10.7
* Updated VirtualBox guest additions to 4.3.0
* Fixed /dev mounting issue
* Fixed grub2 boot directory issue

Tweaks

* Initial portage tree is extracted from the latest snapshot tarball
* Unicode (en_US.UTF-8) is a system default encoding
* Changed a hostname to 'local' for a bit shorter shell prompt
* Cleaned up '/usr/src' directory
* Located an empty local overlay at '/usr/local/portage'
* Now '/etc/portage/package.*' files are directories
* Emerged git, subversion and vim with minimal dependency