Finalize API for MVP

[t-ketchem]

Expand upon current progress to enable a minimum site. This should include all necessary API calls for basic front end mapping of projects.

[chris-french]

This is the current draft of the current API spec: https://gist.github.com/chris-french/526ee6b2b458ff61dd620bdee2a9e594

[chrisschaaf]

This will need to be expanded upon for the buildings project type.