Better error messages when running commands with missing parameters

[willosborne]

Feature Request

Description of Problem:

Currently some of the errors output by the commands are confusing. e.g. running the 'calm validate' command with no arguments produces a large stack trace - even if this eventually does display the right error message.

Potential Solutions:

Tighten the config around our parameters in the Commander config in index.ts to properly indicate which parameters are mandatory.
Potentially add a system for failing more gracefully if things are missing.