code: function _run() {
      _verifyCWD();
  
      var customStartupFilePath = path.resolve(process.cwd() + '/bin/www');
  
      if (fs.existsSync(customStartupFilePath)) {
          require(customStartupFilePath);
      } else if (fs.existsSync(PROJECT_INDEX)) {
          let service = require(PROJECT_INDEX);
          if (!(service instanceof Service)) {
              utils._stderr(`${PROJECT_INDEX} does not export a Service object`);
              process.exit(1);
          }
  
          service.listen();
      }
  }
docs: searches for custom bin/www startup script if not found, it starts up
  the service itself.
  @private
  @return {undefined}