gistfile1.php

use Zend\ServiceManager\ServiceLocatorInterface;
class SimpleHelperFactory implements \Zend\ServiceManager\FactoryInterface
{
    public function createService(ServiceLocatorInterface $serviceLocator)
    {
        // Can't do the same here, because of ServiceLocatorInterface
        $config = $serviceLocator->getServiceLocator()->get('Config');
        // Or I can just ignore problem with ServiceLocatorInterface interface here 

        return new SimpleHelper();
    }
}