Added choose() helper method and more testing on bs to see if the application.config gets populated
Refactorings: created a run_server script & simplified configuration

    Replaced secret with garbage
    Added custom secret key in OS env variable, configured via eb config script
    Removed the app_config variable, all configurations are in application.config; also refactored the /configz endpoint to return more information and mask sensitive keys
    Refactored server run method into its own script (not used by Beanstalk) and created a re-usable utils helper module