func (r MsgPack) Render(w http.ResponseWriter) error {
	return WriteMsgPack(w, r.Data)
}
Render (MsgPack) encodes the given interface object and writes data with custom ContentType.
package render
import (
	"net/http"
	"github.com/ugorji/go/codec"
)
type MsgPack struct {
	Data interface{}
}
var msgpackContentType = []string{"application/msgpack; charset=utf-8"}
func (r MsgPack) WriteContentType(w http.ResponseWriter) {
	writeContentType(w, msgpackContentType)
}