Add example

@jcantrell-trulia @slin-trulia the start of our basic example. Should I be filing this against the gh-pages branch?

A few TODOs

- [x] add toggle.js and dependencies (jquery)
- [x] make the background swatches float on a single line
- [x] add a side menu (??)
- [x] better basic design (maybe @slin-trulia could make a quick pass at the header and footer)
- [x] add javascript library dependencies and make nav and (possible) side nav a bit slicker
- [x] improve the intro and make it clear that this is just to demonstrate the nifty markdown that is output.