add phone to contact us screen

Add's the ability to call the OneBusAway operator from the contact us screen.

![photo sep 22 12 58 01 am](https://f.cloud.github.com/assets/1192780/1187176/be90f024-235c-11e3-9b61-a5487dadb353.png)

![photo sep 22 1 06 21 am](https://f.cloud.github.com/assets/1192780/1187179/ed7a821e-235d-11e3-8853-eca32634108d.png)

This will call `1-000-000-0000` by default (i.e. if you test this PR) but will correctly call the locally OBA operator if we add it to the Regions API as `contactPhone`. This PR assumes `contactPhone` is a required field in the Regions API. @barbeau thoughts on adding to Regions API?