add ext , map to the response template.

apiv1.go

 type apiV1Response struct {
 	Env  apiV1Envelop
 	Body interface{}
+	Ext  interface{}
+	Map  map[string]interface{}
 }
 
 var apiV1Handler = []apiV1HandlerMap{
 
 	res := apiV1ResponseBlank()
 	res.Body = p
+	res.Map["some"] = p
 	apiSendJson(res, w)
 
 }
 
 func apiV1ResponseBlank() (ret apiV1Response) {
 	ret.Env = apiV1EnvelopBlank()
+	ret.Map = make(map[string]interface{})
 	return
 }