[Merge] ~jibel/livecd-rootfs/+git/add_multi_layered_squashfses_support:ubuntu/master into livecd-rootfs:ubuntu/master

[Didier Roche]

Thanks Michael for the review!

Let's try to get the 2 other project (ubuntu-cdimage and debian-cd) MP reviewed/merged so that we can switch to multi-layer and producing iso with those structure.
I amended the changelog to mention you on the review and uploaded livecd-rootfs to the archive.
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https://code.launchpad.net/~jibel/livecd-rootfs/+git/add_multi_layered_squashfses_support/+merge/360878
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