We need to reset the configurations so that Active Record configurations are set back to their defaults.
The application model will keep all of the Active Record configurations, instead of sending the configurations directly to ActiveRecord::Base. This means it will be possible to configure multiple applications if each application has its own ApplicationModel. Also, changing some tests to correspond to these changes.
This functionality has been extracted to the responders gem.
Now that we only support Ruby 2.2+ we don't need this conditional anymore