css loading order + favicon support

### css loading order

I wanted to customize css for the code block to look like github, but the currently prettify.css gets loaded after custom.css, so I flipped the order.
See http://eed3si9n.com/learning-scalaz/Walk+the+line.html

### favicon support

I added favicon support since hotel wifi service replaces favicon, and since pamflets don't have their own favicon, I'm stuck with the icon even after I come home.