Implement --help and --version

[felixSchl]

The developer will be able to specify the option that will trigger the --help and --version convenience functions, with fallbacks to --help and --version.

• Implement --help. If matched, print the docopt text. (feature/help)
• Implement --version. If matched, print either the npm package version or a user-provided version string

[moll]

Not overly difficult to do now, either:

if (args["--version"]) return void process.stdout.write(VERSION_TEXT)

[felixSchl]

Available in version 0.10.0 - https://github.com/felixSchl/neodoc/releases/tag/v0.10.0