Start style guide

This branch adds the basics of the style-guide infrastructure and adds a throbber example.
It also:

* Add normalize.css
* Moves /lib/helpers -> /lib/zutils
* Moves  /statics -> /media
* Uses some grunt/stylus foo to embed images as data-uris.
* Refactor formatters a little so the html output can be used generally and for special API doc responses.