Wee little school finder bugs

# Changes
 - Fix page jumping to top when the user clicks "Show More".
 - Improve appearance of "Show More" button based on design feedback.

# Screenshot
![screen shot 2014-11-07 at 11 45 28 am](https://cloud.githubusercontent.com/assets/583202/4956621/8256f24a-669d-11e4-8fd8-dabb833544a2.png)


Side note, if `.legal` and `.schoolfinder-showmore` technically have very similar styles, we could generalize a class and then `@extend` it to both. Maybe be a future refactor if that makes sense?