Swagger HTTP Origin Header support.

I think it's rarely possible that Im the chosen to be harassed by Allow-Origin header problem.

	XMLHttpRequest cannot load http://localhost:8080/apidocs.json. Origin http://127.0.0.1:8080 is not allowed by Access-Control-Allow-Origin.

I think this functionality (entire ACL) should be covered by go-restful.
Merge pull request #47 from crackcomm/patch-1

Swagger HTTP Origin Header support.