Allow all configuration via package.json.

[Schoonology]

Options like silent have not previously been available in package.json (alongside path, for example). This changes that.

While the style may leave something to be desired, the function is all here, and I can style it how you like.

[searls]

Cool deal, but I have a couple challenges if you're up for it prior to merging:

• tests
• README notes
• a way to flip the package.json setting setting the matching env var to exactly false. that is, if {scripty: { parallel: true } } is set, then I should be able to override it with SCRIPTY_PARALLEL=false npm run lol ad hoc

Thoughts?

[searls]

Also, as punishment for submitting a PR to this project I was planning on giving you commit bit to the project, but you already have it.

[sheerun]

it would be nice to merge

[searls]

I blame @Schoonology for not chiming in with a comment after adding tests -- just added a readme. will merge when the build passes

[searls]

Landed in 1.7.0 -- thanks @Schoonology!