Add cleanup_docker_images to LanguageContainerBuilder #86
Description
The Script-Languages-Container-Tool supports since 1.1.0 an option cleanup_docker_images for its export API which removes the docker images as soon as possible to save disk storage. It also contains other disk storage saving mechanisms. We should update the project to it and add cleanup_docker_images parameter to the export method of LanguageContainerBuilder which we forward to the Script-Languages-Container-Tool.