Merge pull request #4 from mpinhede/master

Moved installed package into a variable in base/debian.
Set the release name in docker/debian7 recipe
Added bootstrap_packages and setup_packages for all recipes
Organized the steps
Put Qemu checkpoint enabled on setup

Strange behavior that mix the out and the in append if the checkpoint
begins on bootstrap
Fixed grid5000 recipes
Added kameleon_customization step
Merge pull request #5 from mpinhede/master

Fixed virtualbox/ubuntu12.04
Merge pull request #1 from oar-team/master

Master