Urban Dictionary - follow the style of the Dictionary IA

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)