Search feature

![Screen Shot 2013-03-19 at 6 41 12 PM](https://f.cloud.github.com/assets/1718372/278928/ca16a078-90ff-11e2-9fa0-c50feb994824.png)

It's basically a copy of django admin's search. You specify `search_fields` in the model view.

Do you care about IE compatibility (haven't checked if the css is fine - probably not)?