Deleted references to AUFS

AUFS is no longer a dependency (both lxc-docker and lxc-docker-git are >=0.7), and the Arch kernel doesn't need to be replaced with AUFS_friendly.
Arch docs: Updated dependencies to match AUR

The AUR packages lxc-docker and lxc-docker-git have changed their dependencies.
Arch docs: Added lxc-docker-nightly AUR package, modified deps

lxc-docker-nightly installs latest build. Removed go from dependencies, as it is not needed in lxc-docker and lxc-docker-nightly. The -git package will flag go as a dependency upon installation.
Merge pull request #2901 from dkumor/patch-1

Deleted references to AUFS in Arch docs