[Merge] ~dbungert/livecd-rootfs:ubuntu-mini-iso into livecd-rootfs:ubuntu/master

[Dan Bungert]

> Was it expected for this to also have a base and live layer?

These layers aren't super relevant for this build, we just need enough of this in place to install casper and mini-iso-tools and a few others and populate the initramfs.  It's a lot of setup though and simplication is desirable.

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https://code.launchpad.net/~dbungert/livecd-rootfs/+git/livecd-rootfs/+merge/436420
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