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

[David Krauser]

Thanks Rob. I pushed up a new commit to address your concerns:

- Updated the commit message to reference version numbers
- Added user facing documentation to grub script 
- Added changelog entry

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https://code.launchpad.net/~davidkrauser/livecd-rootfs/+git/livecd-rootfs/+merge/387862
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~davidkrauser/livecd-rootfs/+git/livecd-rootfs:ubuntu/master into livecd-rootfs:ubuntu/master.