Add React and ReactDOM, at the unpkg CDN.
Created by: jelford
React is now MIT licensed as of version 16. The getting started docs point towards unpkg for those using a cdn, so add support for that.
unpkg uses a different layout to googleapis or cloudflare, so I had to add to the remote resolution in the audit tool. Additionally I added a --filter option to the audit tool to make iterating faster. Usage:
node run --filter react