Added support for MessagePack binding and rendering (#808)

Added deps to vendor.json and fixed rendering bug

binding/binding.go

@@ -15,6 +15,8 @@ const (
 	MIMEPOSTForm          = "application/x-www-form-urlencoded"
 	MIMEMultipartPOSTForm = "multipart/form-data"
 	MIMEPROTOBUF          = "application/x-protobuf"
+	MIMEMSGPACK           = "application/x-msgpack"
+	MIMEMSGPACK2          = "application/msgpack"
 )
 
 type Binding interface {
@@ -40,6 +42,7 @@ var (
 	FormPost      = formPostBinding{}
 	FormMultipart = formMultipartBinding{}
 	ProtoBuf      = protobufBinding{}
+	MsgPack       = msgpackBinding{}
 )
 
 func Default(method, contentType string) Binding {
@@ -53,6 +56,8 @@ func Default(method, contentType string) Binding {
 			return XML
 		case MIMEPROTOBUF:
 			return ProtoBuf
+		case MIMEMSGPACK, MIMEMSGPACK2:
+			return MsgPack
 		default: //case MIMEPOSTForm, MIMEMultipartPOSTForm:
 			return Form
 		}