This update adds parameters numbering and numbering-depth to customize the theorem numbering. In particular, the latter parameter customizes how many levels of the headings are inherited. This was requested in #9 (and #11).
Also, this adds a #theoretic.configure() function which allows setting these for all subsequent theorems, because these seem like things that would be set for all theorem-environments. I may add more options to configure in the future.
Full Changelog: v0.3.1...v0.4.0