Retrieve rating of a published appliance.
Example:
< GET /gallery/123/rating > 200 Ok > > { > uri: "/gallery/123" > , ratings: "5" > , average: "5.0" > }
Rate a published appliance.
Example:
< POST /gallery/123/rating < < { < rating: "3.5" < } > 200 Ok > Content-Location: /gallery/123/rating > > { > uri: "/gallery/123" > , ratings: "6" > , average: "4.75" > }