POST /:account_key/ratings

{"uid": "http://site.bootic.net/products/foobar", "rating": 4}

HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8

$ curl -XPOST -H"Content-Type:application/json" -d'{"uid":"uid1","rating":2}' http://bootic-ratings-service.herokuapp.com/foo/ratings

GET /:account_key/ratings

{
  "uids": [
    "http://site.bootic.net/products/foobar",
    "http://site.bootic.net/products/barfoo",
    "http://site.bootic.net/products/ipod"
  ]
}

HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8

[
  {"uid": "http://site.bootic.net/products/foobar", "rating": 3, "ratings_count":3},
  {"uid": "http://site.bootic.net/products/barfoo", "rating": 4, "ratings_count":20},
  {"uid": "http://site.bootic.net/products/ipod", "rating": 5, "ratings_count":4}
]

$ curl -i "http://bootic-ratings-service.herokuapp.com/foo/ratings?uids=uid1,uid2"