[Merge] ~rs2009/unity-control-center:master into unity-control-center:master

[Rudra Saraswat]

Rudra Saraswat has proposed merging ~rs2009/unity-control-center:master into unity-control-center:master.

Commit message:
Add accent color support, fix appearance panel and change info logo

Requested reviews:
  Dmitry Shachnev (mitya57)

For more details, see:
https://code.launchpad.net/~rs2009/unity-control-center/+git/unity-control-center/+merge/429364

This change adds accent color support, fixes the appearance panel and changes the logo shown in the info panel.
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