accesslog: NEW log broker and many more features

some fixes about context clone, fix response recorder concurrent access, fix reload views with only ParseTemplate and more

_examples/view/parse-template/django/main.go

@@ -11,6 +11,7 @@ func main() {
 	if err != nil {
 		panic(err)
 	}
+	e.Reload(true)
 
 	app := iris.New()
 	app.RegisterView(e)