Use a proper CLI framework

[bramus]

Something like https://github.com/tj/commander.js or https://github.com/mattallty/Caporal.js

Or, to keep it more lightweight, only rely on https://github.com/75lb/command-line-args

(This opens the door to supporting things like limiting lookups to only CSS features using a flag in the future)

[bramus]

Or maybe the new kid on the block: strictly?