dont include lxc cookbook and aufs recipe on ubuntu 13.10 and up
remove lxc recipe from ubuntu 12.04 as well
fix(lxc): Only remove dependency for package installs
Merge pull request #37 from jayofdoom/jay/no-lxc-or-aufs-on-saucy

dont include aufs recipe on ubuntu 13.10 and up; don't require docker::lxc for package installs