Add babel-plugin-unpkg-rewrite package

packages/babel-plugin-unpkg-rewrite/README.md

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+A [Babel](http://babeljs.io/) plugin that rewrites bare ES module specifiers as
+[unpkg](https://unpkg.com) URLs.
+
+## input
+
+```jsx
+import React from "react"
+import router from "@angular/router"
+import map from "lodash.map"
+import fs from "pn/fs"
+import cupcakes from "./cupcakes"
+import shoelaces from "/shoelaces"
+import something from "//something.com/whatevs"
+import something from "http://something.com/whatevs"
+let ReactDOM = require("react-dom")
+export React from "react"
+export { Component } from "react"
+export * from "react"
+export var message = "hello"
+```
+
+## output
+
+```jsx
+import React from "https://unpkg.com/react@15.6.1?module"
+import router from "https://unpkg.com/@angular/router@4.3.5?module"
+import map from "https://unpkg.com/lodash.map@4.6.0?module"
+import fs from "https://unpkg.com/pn@1.0.0/fs?module"
+import cupcakes from "./cupcakes?module"
+import shoelaces from "/shoelaces?module"
+import something from "//something.com/whatevs"
+import something from "http://something.com/whatevs"
+let ReactDOM = require("react-dom")
+export React from "https://unpkg.com/react@15.6.1?module"
+export { Component } from "https://unpkg.com/react@15.6.1?module"
+export * from "https://unpkg.com/react@15.6.1?module"
+export var message = "hello"
+```