Documentation of architecture and third party integrations

[ryanwilsonperkin]

The architecture of our app is fairly straightforward, trying to keep to Django conventions as much as possible, but there are some unique bits that would be worth further documentation.

• The GeoJSON decoding feature that's used to detect if a recipient is within the supported boundaries
• The MapQuest integration to fetch (and anonymize) a latitude & longitude from a given address
• The Google Maps integration to embed maps
• The TextLine integration to send text messages to recipients