package.json repository field

newer versions of NPM (v1.2.20) complains when there is no repository info in packages you use every time you run `npm install`.

![screen shot 2013-08-07 at 10 58 07](https://f.cloud.github.com/assets/762956/923159/8a2b0f86-ff3f-11e2-92fa-d2a3518e9254.png)