Random Sudoku remake/redo

Hello again,

As requested, this is a cleanup based on https://github.com/duckduckgo/zeroclickinfo-goodies/pull/140

I've removed some of the functionality and cleaned up the HTML/CSS a bit.

![randomsudoku](https://f.cloud.github.com/assets/978048/1559388/4c2308ae-4fcd-11e3-8be4-debd8c2bdfde.png)

As usual any feedback welcome!

Thanks,
-Rob