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When I tried to standup this project on Heroku the map didn't work because as google now requires (as of two months ago) an API key for apps hosted on a domain:
http://googlegeodevelopers.blogspot.com.au/2016/06/building-for-scale-updates-to-google.html
This PR adds support for adding a key, and instructions for setting it up on heroku.