Inuit.css "Kitchen Sink" example page

As discussed in #121 here's an examples page for review. It'll be a stopgap until we get an automated strategy using the CSS comments like [StyleDocco](http://jacobrask.github.io/styledocco/) or [KSS](http://warpspire.com/kss/)

Things to note:
* The page is at `kitchen-sink/index.html`, i.e. URL will be `/kitchen-sink/`.
* Examples are broken up into different files within `_includes/kitchen-sink/`
* I don't use the default `gh-pages` CSS styles as the example page uses Branch v5.1.0 and has a more stripped back style.
    * `css/kitchen-sink.css` includes inuit.css v5.1.0 (`.scss` not included) and some basic demo styles (see `css/ui/demo.scss`). I have left it unminified as I guess the CSS is documentation too.

If anything needs to change let me know.

Thanks,
Pat