[NH] Return facility-city-state with scans

[Pivotal](https://www.pivotaltracker.com/story/show/78496666) but two other PRs will need to go through to actually deliver that story. This can be merged prior.

The city, state combination is determined from the facility zip and a csv
provided by the usps.
The USPS didn't use leading zeros in their data so I thought it safest to not use them in ours. This will handle the case where the USPS would give us a facility-zip without the leading zeros, if that should ever happen.