Add Unpublish or Revert Site Feature and Option to Duplicate Gamma Before Publishing

Add the ability to unpublish or revert a site, or alternatively, force a duplication of the Gamma prior to publishing, allowing the user the multiple formats. I ran into this issue recently while putting together my submission for the rebrand contest and thought I would try to publish it as a site to enable a thumbnail capture on my submission. My bad, but I would have preferred sharing the Gamma itself...