webapi 501 (Not Implemented)

一路神坑~

参考：

How to Fix Asp.net MVC Web Api HTTP PUT and DELETE requests failing

http://www.proworks.com/blog/2012/11/14/how-to-fix-aspnet-mvc-web-api-http-put-and-delete-requests-failing/

http://stackoverflow.com/questions/11727525/asp-net-mvc-web-api-http-put-and-delete-requests-failing