code: function killServers(exitCode) {
    logger.info('Cleaning up running servers');
  
    if (seleniumServer) {
      logger.info('Closing selenium server');
      seleniumServer.kill();
      seleniumServer = null;
    }
  
    // Catch protractor's "Kitchen Sink" error.
    if (exitCode === 199) {
      logger.warn('Supressing protractor\'s "kitchen sink" error 199');
      exitCode = 0;
    }
  
    server.stop();
    logger.info(`Execution Time: ${(new Date().getTime() - start) / 1000} seconds`);
    logger.info(`Exiting process with ${exitCode}`);
    process.exit(exitCode || 0);
  }
docs: Handles killing off the selenium and webpack servers.
  @name killServers