don't put RAILS_ENV into the .env file - chicken and egg

see https://github.com/bkeepers/dotenv/issues/19 for more info

.example-env

@@ -1,5 +1,3 @@
-export RAILS_ENV='development'
-
 export DB_USERNAME='postgres'
 export DB_PASSWORD='3112'
 export DB_HOST='localhost'

config/application.rb

@@ -1,9 +1,13 @@
 require File.expand_path('../boot', __FILE__)
 
 require 'rails/all'
+require 'dotenv'
 
 Bundler.require(*Rails.groups)
 
+ENV["RAILS_ENV"] ||= ENV["RACK_ENV"] || "development"
+Dotenv.load ".env.#{ENV["RAILS_ENV"]}", '.env'
+
 module Metamaps
   class Application < Rails::Application
     # Settings in config/environments/* take precedence over those specified here.