Urban Dictionary - follow the style of the Dictionary IA (WIP)

Fix for issue #704 - work in progress. It misses the audio part, which I suppose needs to be done redirecting to the Wordnik's API, but how? Do you have any particular function to redirect requests to other Spice APIs? I've first tried to accomplish this result by myself, but...

Anyways, first screenshot, Desktop view:
![screen shot 2014-08-02 at 12 13 42](https://cloud.githubusercontent.com/assets/3652195/4028667/be5c70f4-2c40-11e4-9183-62796f7c5b9f.png)

I think we'd need to use [hasOwnProperty](https://bonsaiden.github.io/JavaScript-Garden/#object.hasownproperty) here because we ran into a problem where a `for in` put in other properties of the array https://github.com/duckduckgo/zeroclickinfo-spice/pull/907#issuecomment-48484412.

Either that or you could just go through each one using the index.