Added logging to celery.
Added logging to celery.

memex-explorer/memex-explorer,firebitsbr/memex-explorer,firebitsbr/memex-explorer,memex-explorer/memex-explorer,memex-explorer/memex-explorer,kod3r/memex-explorer,kod3r/memex-explorer,kod3r/memex-explorer,memex-explorer/memex-explorer,YongchaoShang/memex-explorer,firebitsbr/memex-explorer,firebitsbr/memex-explorer,YongchaoShang/memex-explorer,YongchaoShang/memex-explorer,kod3r/memex-explorer,YongchaoShang/memex-explorer