v1.37.0

• Remove RAILS_ENV definitions
• Set development action_mailer.delivery_method to :file
  so that mails are copied to ./tmp/mails/ directory for easy development
  access.
• Update Bourbon to v5.0.0.beta.3
• Update Bitters to v1.3
• Update Autoprefixer config, drop support for IE 9, IE 10 and iOS 7
• Better db support in linux environments
• Replaces coffeescript with babel
• Update CSS tests to ignore transitions