Add module Setting to package.json

[DeedleFake]

This is a workaround to get adbkit working with webpack and other, similar systems. It lets it know that imports should import lib/adb.js instead of index.js.

I will be sending a corresponding pull request for adbkit-monkey. adbkit-logcat doesn't need the workaround because it no longer uses CoffeeScript.

[bmcgary]

@sorccu Anything we can do to help get this merged in and published? Would really help my app.