Configure via command line args

[WesCossick]

Support configuring Rugged via command line args, like --inject-as-dev-dependency or yarn-mutex-file-path=/tmp/example. Pretty much every configurable option should have a command line equivalent.

These args could be used in the script itself (e.g., in package.json you could write "test": "rugged --inject-as-dev-dependency"), but could make Rugged more useful as a globally-installed package that you run directly from a terminal.

To accomplish this, we can power Rugged with Waterfall CLI. We should probably release Waterfall CLI v1 first, though.