Merge pull request #44 from axsh/update-vmbuilder

update vmbuilder.
remove specified mirror site.
handle baseurl.
Merge pull request #45 from axsh/use-vault

Use vault
enable to set distro_ver.
enable to set distro_ver with distro_ver.conf.
Merge pull request #46 from axsh/set-distro-ver

Set distro ver
use if-sattement.
Merge pull request #47 from axsh/set-distro-ver

use if-sattement.
Merge pull request #48 from axsh/update-vmbuilder

update vmbuilder.