Load plugins with async

Hey Steve! Saw your post on Planet Debian and nothing better that help a fellow hacker at 04:30am :-D

I know you already received 998f305d7ec4d5988c341efc144abdfd0865c43e but that's kind of hacky. Here's the node-way.

You need to install `async`, so a `package.json` file would probably help you a lot. Don't understand neither why you didn't just `npm install redis` (as you should with `async`) and put them as dependency in your `package.json` so deployment is a simple `npm install` and you are ready to go.

Hope is useful! Here's a proof the tests are passing :-)

![screenshot from 2013-09-13 04 23 50](https://f.cloud.github.com/assets/33868/1137000/ae57c690-1c51-11e3-9514-febe8871e652.png)

Happy hacking!