Add sass.js 0.2.0

Tagged on GitHub: https://github.com/medialize/sass.js/tree/v0.2.0/dist

It's well short of the recommended 100 watchers (more than 100 stars, though), but [Sass/SCSS](http://sass-lang.com/) is certainly popular, and this seems to be the best JS Sass compiler out there (built in the same manner as [node-sass](https://npmjs.org/package/node-sass)).