code: function getNewComponents(components, registry) {
      var componentNameHelper = {};
      components.forEach(function (component) { return (componentNameHelper[component._componentName] = true); });
      var componentNames = Object.keys(componentNameHelper);
      return componentNames.filter(function (componentName) { return !registry._activeComponents[componentName]; });
  }
docs: Filters the given component list and returns the names of those components which have never been started before