[Merge] ~tobhe/livecd-rootfs:unity into livecd-rootfs:ubuntu/master

[Steve Langasek]

Review: Disapprove

This belongs in the seed (lp:~unity7maintainers/ubuntu-seeds/+git/ubuntu-unity), not in livecd-rootfs.  I've just pushed a commit that drops all of these add_package commands in favor of pointing at the seed.
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https://code.launchpad.net/~tobhe/livecd-rootfs/+git/livecd-rootfs/+merge/445061
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