* cwebber/254_delete_queue_directories:
Removing docstring bit about delete_file possibly deleting directories in the future
Convert media processing backends to delete the queue directory (#254)
Implement delete_dir in the FileStorage
Conflicts:
mediagoblin/media_types/image/processing.py
mediagoblin/media_types/video/processing.py
Conflicts, because those media_types already use the newer
proc_state.delete_queue_file() method (which needs
updating.
2dd0af3635