Make Openaddresses version master

@lyzidiamond nice work with this. Given that most people will be interested in the Openaddresses side of the project I propose we make it master and let Lexington live on the [lex-deploy branch](https://github.com/codeforamerica/lexington-geocoder-flask/tree/lex-deploy). (iirc you mentioned the same idea recently)

(related #52)