Support the list of accepted media types in the Swagger spec properties "consumes" and "produces"

[steve-jansen]

The Swagger UI lists the available "Response Content Type" as a drop down of media types, like application/json or 'text/xml`

The list of supported media types in WebAPI should be queried via something like:

HttpConfiguration configuration;
List<string> list = new List<string>();

foreach(var formatter in configuration.Formatters)
{
    foreach(var mediaType in formatter.SupportedMediaTypes)
    {
        list.Add(mediaType.MediaType);
    }
}

list.Sort();

return list;

In theory, this list could be used for both the consumes and produces properties of an API.

See more:

• Add content-type metadata to operations swagger-api/swagger-core#77
• https://github.com/wordnik/swagger-core/wiki/Specification-Roadmap