Version 1.0.0: Docker

This version refactors the code to work in a Docker container. This involves some breaking changes:

• The python code was moved into a src/ subdirectory
• The entrypoint is now streamlined to python -m papertoaster ARTWORK_ID [args]

This repo now produces two Docker images:

• ptrgags/paper-toaster - for the main Python script
• ptrgags/post-toast-ghost - For the optional GhostScript post-processing

See the README for new usage.