code: def load_config_module():
      
      import imp
      config_path = config_location()
      try:
          config = imp.load_source('config', config_path)
      except IOError:
          log.critical('Config file not found. oaepub exiting...')
          sys.exit('Config file not found. Please run \'oaepub configure\'')
      else:
          log.debug('Config file loaded from {0}'.format(config_path))
          return config
docs: If the config.py file exists, import it as a module. If it does not exist,
      call sys.exit() with a request to run oaepub configure.