Add kind filter

- Adds kind search filter:

![screen shot 2013-09-20 at 3 53 26 am](https://f.cloud.github.com/assets/704760/1179054/c47e4a52-21c9-11e3-9295-3bea6c267025.png)

- Updates pagination links so they retain existing parameters (this could use some refactoring)

@monfresh ready for review and merge. It passes locally.