[Merge] lp:~khurshid-alam/unity-control-center/use-usd-schemas into lp:unity-control-center

[Khurshid Alam]

@seb128

U-c-c pulls unity-settings-daemon and unity-settings-daemon pulls unity-settings-daemon-schemas. 
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https://code.launchpad.net/~khurshid-alam/unity-control-center/use-usd-schemas/+merge/372174
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