Remove tiny xs

Trello: https://trello.com/c/pilfltjP/406-redesign-labels-for-search-terms-at-top-of-finder

Before: 
![screen shot 2014-11-13 at 10 53 37](https://cloud.githubusercontent.com/assets/68009/5027121/5fa984bc-6b23-11e4-8cf6-0538e6a8727c.png)

After:
![screen shot 2014-11-13 at 10 53 27](https://cloud.githubusercontent.com/assets/68009/5027124/6380aa5c-6b23-11e4-9556-82853a347585.png)

tl;dr Nobody ever uses these tiny crosses (lovely as they are) so we're pulling them. This PR removes the code, tests and styling for them.

Just realised @futurefabric is out until next week, sooo anyone else want to take a look at this?
If you include the helpers you could use something like `content_tag(:strong, value.label)` which would handle the escaping for you I believe.