Sterne-stable

Stable release of the old creation API.

This fixes a number of bugs from 0.3-beta over the last several months, and adds some features specifically to work with the Hathi files.

The changes are particularly important for the incorporation of outside metadata into pre-existing bookworms.

From this point on, new development will take a different folder structure, so I'm tagging this release as a stable point for the old server-side API.