Fix BL-783: "Additional Requests" in license overlap the CC logo
Merge pull request #168 from BloomBooks/BL-783-RoomForAdditionalRequests

Fix BL-783: "Additional Requests" in license overlap the CC logo
BL-780 Refine which PDF controls show in Publish view

* Hides "Show Thumbnails" button, which didn't do anything
* Hides sidebar with thumbs
* Enables "Toggle Sidebar" button, which now works to show
   the thumbs when clicked.