Congress: search by location, zip code, and including 'from'

A few more search features:
1. Search by zip code. 
![zip2](https://cloud.githubusercontent.com/assets/1882892/2542851/3ea8f604-b5ec-11e3-90e0-c2afcfe85373.png)
2. Search terms including "from". 
![repsfrom](https://cloud.githubusercontent.com/assets/1882892/2542818/bf648610-b5eb-11e3-9161-bbd40f6d736d.png)
3. If no state or location is given then it uses latitude/longitude. 
![loc](https://cloud.githubusercontent.com/assets/1882892/2542781/52b4528e-b5eb-11e3-87c9-e927dc847e00.png)