Use asset pipeline + SASS & Compass + minifiers

Hi again!

This is kind of a restructuring of the current website using an asset pipeline so your CSS and JS gets automatically minified & merged into a single file.

Note that you will have to install the gems required to make this work:

```
bundle install
```

And develop watching the files to change:

```
jekyl serve --watch
```

I've used some compass helpers to auto-prefix things like `box-shadow`, `text-shadow` and such.

Hope you like it!

(it looks huge but it's just because it comes with the compiled files!)