Added a line in .gitignore (rbenv installation)
Change definition Debian 6.0.7 because the ISO is no more directly downloadable
--hwvirtexexcl  : this command does not exist with VirtualBox v4.3
Add definition for Debian 6.0.8 (i386 and amd64)
Merge pull request #842 from leopoiroux/master

Add definition for Debian 6.0.8 (i386 and amd64)