Puppeteer Util

This package downloads and uses puppeteer at runtime.

This gives us two benefits:

1. It does not need to be packaged with any installer (packaging puppeteer causes Apple to refuse to sign the installer)
2. Multiple components can use the same installed puppeteer (useful for Everlife Skills)

Example:

const puppeteerUtil = require('./index')
async function test() {
  let browser =  await puppeteerUtil.launch({ headless: false, slowMo:       100, args: [ '--proxy-server="direct://"', '--proxy-bypass-list=*']})
  let page = await browser.newPage()
}
test()