Add yellow css-styles for HEAD divs

![Bildschirmfoto4](https://f.cloud.github.com/assets/2581480/302397/67299992-9605-11e2-8eac-180b21f03e47.png)
I added the missing css rules for the HEAD request (body ul#resources li.resource ul.endpoints li.endpoint ul.operations li.operation.head) and following.

regards Thomas