Added accessors for uploader and upload date
Added accessors for uploader and upload date


Former-commit-id: 0a4242cb725d5dfb9612076865b595ce23d657c5
openworm/PyOpenWorm,hnunner/PyOpenWorm,openworm/PyOpenWorm,kaustubhcs/PyOpenWorm,gsarma/PyOpenWorm,travs/PyOpenWorm,gsarma/PyOpenWorm