Add support for a "HELP" verb in the HackMyResume CLI, allowing separate help
pages for each HackMyResume command per #205. The following command invocations
are recognized.
hackmyresume help
hackmyresume help build
hackmyresume help new
hackmyresume help convert
hackmyresume help analyze
hackmyresume help validate
hackmyresume help peek
hackmyresume help help
