mozilla/zamboni — pull request #1539 by ngokevin (2013-12-13 19:48:22+00:00)
Title: fix editing content ratings in admin settings form (bug 949967)

I believe the issue was the ```content_ratings.create``` did not play well with the ```ContentRatings.unique_together('addon', 'ratings_body')```.

Use ```set_content_ratings``` which does a get_or_update.