I don't understand. Why instantiate it when there's a ready instance available? Re-creating an instance each time is unnecessary work: I'd have to use `PluginManager::new`, passing the `Site` to it, and call `#load` (re-requiring all the files; don't know Ruby enough to say if that would mean conflicts). Instead I load the plugins one time and re-use the instance. After all, I don't create a new instance of `Site` each time I need one.