:bomb: V2 boxes creation scripts
Scaffold new base boxes rake tasks and remove old files
Add ubuntu lxc template from staging (https://github.com/lxc/lxc/blob/188e0ab60bda276c688ad15877c6d6402081c6c9/templates/lxc-ubuntu.in)
%s/@LOCALSTATEDIR@/\/var/g
boxes/ubuntu: create base container
boxes/ubuntu: Configure vagrant user

This commit applies @smaftoul patch from https://gist.github.com/smaftoul/2d6fcf43b7c6545aa588/revisions
Add new bash script to build base ubuntu box
:bomb: old stuff
Just enough code to deal with building base ubuntu boxes with support for configuration management tools
apt-get upgrade when building base boxes
Bring back "generic" template that was accidentally removed
Remove unused arguments from generic lxc template and introduce support for the rootfs param
Assume that we are running the ubuntu base box builder with a local checkout + add date / time to box metadata.json
Embed vagrant key into builder script to avoid downloading it all the time
Add script for building debian base boxes
Minor tweaks for the base ubuntu box script
Backport #91
Clean up after ourselves when building base boxes
Docs about base boxes
Update README