Implement `Touch`

[jfirebaugh]

Basic info:

• Node.js version: v8.9.3
• jsdom version: 11.6.2

Minimal reproduction case

const { JSDOM } = require("jsdom");
const dom = new JSDOM();
new dom.window.Touch({identifier: '', target: dom.window});

This throws "TypeError: dom.window.Touch is not a constructor."

How does similar code behave in browsers?

It works: http://jsbin.com/tavariviju/edit?js,console

Standard: https://w3c.github.io/touch-events/#touch-interface

[detj]

#1508 is a duplicate?