made long facet labels and images not cause div explosions

This PR fixes some problems that appear in narrower browsers.

### /dashboard/files
#### Before
Note the facet arrow ">" dropping down out of place
![before-dashboard](https://cloud.githubusercontent.com/assets/74879/3741098/6541a00a-175c-11e4-8902-39bc0478eef4.png)

#### After
![after-dashboard](https://cloud.githubusercontent.com/assets/74879/3741101/6986ff66-175c-11e4-9cfd-4d8902842482.png)

### search results
#### Before
The image bleeds into the details
![before-search](https://cloud.githubusercontent.com/assets/74879/3741103/6dbd0c4c-175c-11e4-9f25-a5ba52e222e1.png)

#### After
The image shrinks to fit the column. If the page is wide, the image will remain its original size--it only shrinks as necessary.
![after-search](https://cloud.githubusercontent.com/assets/74879/3741105/73bf1374-175c-11e4-834f-cb5c7e19a4d6.png)