[Merge] lp:~jamesodhunt/goget-ubuntu-touch/record-sideload into lp:goget-ubuntu-touch

[Sergio Schvezov]

As I said on irc, this looks great; I would change:
- writeLocation to a factory reset safe location 
- maybe instead of storing sideLoaded and do if sideLoaded you can just if coreCmd.DeviceTarball != "" (which is essentially the same).
- remove the changelog change, I will draft a proper one when this is released into the archive.
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https://code.launchpad.net/~jamesodhunt/goget-ubuntu-touch/record-sideload/+merge/256190
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