Feature/complete postgis setup

@svevang I think this will fix:
https://www.pivotaltracker.com/story/show/77239262

What a pain. I'm not sure if there's a better way - but another approach would be to monkey patch this guy:
http://apidock.com/rails/v3.2.3/ActiveRecord/Base/ConnectionSpecification/Resolver/connection_url_to_hash

I'm not even sure if that method exists anymore, but... moving forward unless you're interesting in digging deeper.