Update how the 'X mapped' badge/text is shown

The comma before the badge can look a bit odd, so this pull request:

- removes the comma
- adds a bit of margin before the "X mapped" badge
- vertically aligns the badge with the bottom of the text

![default_exhibit_-_blacklight_search_results](https://cloud.githubusercontent.com/assets/101482/2866251/70ababf0-d226-11e3-99d9-cc64135dd940.png)

![default_exhibit_-_blacklight_search_results 2](https://cloud.githubusercontent.com/assets/101482/2866254/74de222a-d226-11e3-9da6-b5e7cf8883fd.png)

![default_exhibit_-_blacklight_search_results 3](https://cloud.githubusercontent.com/assets/101482/2866255/781ca2cc-d226-11e3-93f3-4ca38caa2da3.png)