merge pdfshadow into batch script; parameterized with argparse; date/simple db logic
rename batch script and update README.md

from crontab run something like /home/ec2-user/appstrap/cronic/cronic /home/ec2-user/code/pdfu/run_nightly_batch http://.../oac-ead/prime2002/ s3://pdf-generation/pdfs/ /home/ec2-user/shadow2.tar.gz