Kenneth Johnson

Per your documentation (http://django-versatileimagefield.readthedocs.io/en/latest/deleting_created_images.html), images can be automatically deleted when the model is deleted by adding this code: ``` @receiver(models.signals.post_delete, sender=ExampleImageModel) def delete_ExampleImageModel_images(sender, instance, **kwargs): """ Deletes ExampleImageModel image renditions...

Following your documentation at http://django-versatileimagefield.readthedocs.io/en/latest/deleting_created_images.html, I have been unable to get manual or auto-deletion of images to work. Any ideas? (While issue #53 seems similar, I am getting these errors...