download.py: take an optional URL on the command line
download.py: take an optional URL on the command line

ultilix/catawampus,pombredanne/catawampus,ultilix/catawampus,ankurjimmy/catawampus,shineyear/catawampus,shineyear/catawampus,pombredanne/catawampus,ankurjimmy/catawampus