Generated service worker uses file paths under Windows 10

Created by: jorispz

Can you reproduce the problem with latest npm?

Yes, I upgraded to the npm version 4.6.1 and the proble is reproducible

Description

Under windows, in a brand new project created with create-react-app, the service worker uses the location on disk of the files to be cached in its cache configuration.

Expected behavior

The service worker uses the proper URLs for caching configuration

Environment

react-scripts@1.0.0 node v6.10.1 npm 4.6.1

Windows 10 Any browser (not a browser issue)

Reproducible Demo

Create a brand new app with create-react-app in the environment above, run npm run build, and check the contents of service-worker.js. It contains file paths, such as

var precacheConfig = [
  ["C:/dev/temp/pwatest/build/index.html", "df24d8c1abce89d06bc00d2023cdad0c"],
  [
    "C:/dev/temp/pwatest/build/static/css/main.9a0fe4f1.css",
    "3473922d6aed4c20bb69846d6027cacf"
  ],
  [
    "C:/dev/temp/pwatest/build/static/js/main.23e5d2a8.js",
    "d0f59b7dffbc3ff4835b038c8f3a4fdc"
  ],
  [
    "C:/dev/temp/pwatest/build/static/media/logo.5d5d9eef.svg",
    "5d5d9eefa31e5e13a6610d9fa7a283bb"
  ]
]