Improvement to Methadone Clinic [http://github.com/dennisjbell/methadone-clinic] that adds subcommands, option interaction rules (requires/excludes), and improved argument handling, while continuing to provide a lot of small but useful features for developing a command-line app, including an opinionated bootstrapping process, some helpful cucumber steps, and some classes to bridge logging and output into a simple, unified, interface that was in Methadone 1.9