UX overhaul to feed item search page.

r? @ngokevin @spasovski

## Before

![screen shot 2014-07-24 at 12 51 28 pm](https://cloud.githubusercontent.com/assets/23885/3692307/40fb6546-135b-11e4-8f49-3dee98bd4230.png)

![screen shot 2014-07-24 at 12 54 46 pm](https://cloud.githubusercontent.com/assets/23885/3692336/9f7d9012-135b-11e4-9b08-85c053e47448.png)

## After

![screen shot 2014-07-24 at 12 49 22 pm](https://cloud.githubusercontent.com/assets/23885/3692280/0a0ac284-135b-11e4-9452-7cb59e6d7018.png)

![screen shot 2014-07-24 at 12 49 29 pm](https://cloud.githubusercontent.com/assets/23885/3692279/0a09adcc-135b-11e4-938f-a2e9a62d3409.png)