Accurate crossword thumbnails (the animated GIF will explain all)

![crosswordz](https://cloud.githubusercontent.com/assets/1001642/4835113/0aa75b6c-5fb4-11e4-97aa-a2596f3d9731.gif)

@garynewby gave me the idea.
can pass an object to `attr` - https://github.com/ded/bonzo#api-attr