two argument parsers in use

[paul-krohn]

It's my fault, I introduced the second one. I'll refactor to consolidate on argparse, since typing of some args is an issue. cc @tmclaugh and @crccheck.

[crccheck]

I like docopt, but I'm not attached to it for this project since it's so simple. I'm also very interesting in seeing how this would look with https://github.com/chriskiehl/Gooey in front, which only works with argparse.