Our prepare-dev.py was doing quite a few things that weren't best

practices:

Global mutable state in the form of options.
Using the deprecated optparse module instead of argparse.
No docstrings anywhere.

These issues have all been addressed. Where we were previously using

global mutable state we now pass our state as an argument to the

function that requires it (create_settings). Our argument parser has

been updated to use argparse.ArgumentParser. The module and all

functions now have docstrings that meet our documentation guidelines.
Additionally, I cleaned up control flow a bit in main() where things

were running in a try..except that didn't need to.

Ran prepare-dev.py and it ran correctly.