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

[Jean-Baptiste Lallement]

Jean-Baptiste Lallement has proposed merging ~jibel/livecd-rootfs/+git/add_multi_layered_squashfses_support:ubuntu/master into livecd-rootfs:ubuntu/master.

Commit message:
Adds support for multi layer filesystem by generating one squashfs per layer based on PASSES defined by project.
squashfs are numbered so the order is preserved and mounted in order by casper.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)

For more details, see:
https://code.launchpad.net/~jibel/livecd-rootfs/+git/add_multi_layered_squashfses_support/+merge/360878

This MP is a resubmit of https://code.launchpad.net/~jibel/livecd-rootfs/add_multi_layered_squashfses_support/+merge/358490 due to the bazaar branch not being active anymore.
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~jibel/livecd-rootfs/+git/add_multi_layered_squashfses_support:ubuntu/master into livecd-rootfs:ubuntu/master.
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