Filename consistency with Overdrive/Source Files
Overdrive downloads were called "part" instead of "chapter". Chapter implies something different--parts are about 70 minute segments, which may contain one or more book chapters in them.
Also adjusted padding to 2 digits instead of 3, which was in use by Overdrive.
I believe this is also consistent with the source files downloaded by the tool.
Merge pull request #17 from jdustinlewis/main
Filename consistency with Overdrive/Source Files