Updated and improved gentoo-latest-amd64 template.

Updates and Fixes

* Kernel based on 3.10.7
* Updated VirtualBox guest additions to 4.3.0
* Fixed /dev mounting issue
* Fixed grub2 boot directory issue
* Added a mount point for veewee test. (/veewee-validation)

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.
* Added empty local overlay at '/usr/local/portage'.
* Now '/etc/portage/package.*' files are directories.
* Emerged git, subversion and vim with minimal dependency.
Cleaned up
bump version
another version bump