Capture and display all emails and all address lines

Migrates emails and address lines to JSON fields (arrays) for `agencies` and `offices`. Fixes #127.

Requires migration, and data re-load. The migration removes the old `email` and `address_line_1` columns.

With [DoD's TRICARE](https://foia.18f.us/contacts/department-of-defense--tricare-management-activity) as an example -

### Before

![before](https://cloud.githubusercontent.com/assets/4592/4709533/307ebd96-58a0-11e4-9633-8b4f4032410c.png)

### After

![after](https://cloud.githubusercontent.com/assets/4592/4709542/459ceb4e-58a0-11e4-9a0b-f5883ec96577.png)