http://attributerouting.net/#asp-net-web-api
https://github.com/johnpapa/CodeCamper/blob/master/CodeCamper.Web/App_Start/WebApiConfig.cs （方法二）
http://aspnetwebstack.codeplex.com/wikipage?title=Attribute%20routing%20in%20Web%20API
https://github.com/ASP-NET-MVC/aspnetwebstack