Directory structure & bower

Hey, I tried to modularize your work and make it more suited for package management. The main differences are:

* Used **Stylus** instead of CSS.
* `src` folder containing the source, and `dist` containing the build files
* Used **gulp.js** to build the `.styl` into `.css`
* Combined skeleton and normalize.css together and **minified** the result
* Created the first attempts of a `bower.json`

I hope you'll find that since your code is mostly untouched. Let me know if anything doesn't make sense, and I'll do my best to make it clearer.