Link hover

Fixes DoSomething/dosomething#1555.

Links and secondary links:
![screen shot 2014-03-28 at 11 51 50 am](https://cloud.githubusercontent.com/assets/583202/2551710/79a6b0c0-b691-11e3-8d6a-9e64faacb352.png)

Button states:
![screen shot 2014-03-28 at 11 51 31 am](https://cloud.githubusercontent.com/assets/583202/2551712/811d7e1a-b691-11e3-9b57-c5cdfe51a031.png)

Legal styles:
![screen shot 2014-03-28 at 11 57 14 am](https://cloud.githubusercontent.com/assets/583202/2551723/a830f608-b691-11e3-8864-b795b013b8bd.png)