Style RSS link on News Portlet (of ftw.contentpage)

@ninfaj 

Currently it looks like this:
![screen shot 2014-01-22 at 9 24 34 am](https://f.cloud.github.com/assets/437933/1972006/fe7b30d6-833e-11e3-8024-8b258c9b841a.png)


Imho am RSS image would be better.

Or what do you think?