Remove URL from "link" content type in full view mode.

#6070 

The URL is now removed from "full" view mode of a link.

Before:
![selection_214](https://cloud.githubusercontent.com/assets/4497748/3079711/5bc9daa2-e4a2-11e3-91ee-598d4ae9458a.png)

After:
![selection_212](https://cloud.githubusercontent.com/assets/4497748/3079717/69bb0424-e4a2-11e3-900c-a20e47f30c01.png)