[Merge] lp:~ogra/phablet-tools/phablet-tools-fix-writable-image into lp:phablet-tools

[Oliver Grawert]

@sergio 
the in-shell printf needs double quotes, else the "printf '$format' 'line1' 'line2'" notation will not work.
i fixed the other quoting.
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https://code.launchpad.net/~ogra/phablet-tools/phablet-tools-fix-writable-image/+merge/234946
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