Recipes: No need to prepend the hostname to the asset.

It looks like it's unnecessarily appending `window.location.hostname` which is breaking the asset on DuckPAN.

CC @bsstoner 

Old:
![screen shot 2014-07-09 at 9 17 19 am](https://cloud.githubusercontent.com/assets/81969/3524671/61e89b30-076b-11e4-97cd-163533282363.png)

New:
![screen shot 2014-07-09 at 9 13 56 am](https://cloud.githubusercontent.com/assets/81969/3524649/1ad438ee-076b-11e4-8e0c-7bbd672b7f42.png)