Changed Add Artist and View on MusicBrainz for Search Results

In reference to #1617, the add artist link and the view on MusicBrainz site were switched around for a more expected experience. MusicBrainz doesn't really have an icon so switched to just text for now. Removed trailing whitespace as well. 

![screen shot 2014-05-13 at 9 17 38 pm](https://cloud.githubusercontent.com/assets/745107/2966041/9984b6b0-db05-11e3-828f-db8accd3736d.png)