Feature: Tool to mutate ROOT package.json with specified archetype tasks

[coopy]

Strawman:

• Mutate ROOT package.json and add in any archetype commands prefixed with npm:
• Do collision detection and warn / rename with e.g :backup for existing commands that would be rewritten
• Do Warn if archetype implements any npm lifecycle tasks #81 at the same time (warn if archetype implements any npm lifecycle tasks).