Fix deserialization of "authorizations" fields

codegen was choking on the JSON produced by swagger 1.3.2, because the format of the authorizations fields has changed.

Deserializer should expect a `Map[String, AuthorizationType]`, not a `List[String]`.

Note that this is basically the same fix as wordnik/swagger-core@52b7e0b4aee3ea6aa19422ffeeb95dcce53f2c35