Ability to use library without CLI

[benmccann]

Would you accept a PR to refactor this library into a library and a CLI consuming that library? I expect most users only need a library. At least that's true for my own use case.

Quite a lot of the dependencies come from the CLI. E.g. the following are used only in bin.js:

• help-me
• pump
• joycon
• strip-json-comments
• minimist

There may be others that are pulled in by the CLI transitively and not through the library entry points

[jsumners]

I don't see a need to do so.