Deprecate this repo

[beck]

Upstream now has a few extra maintainers (including myself).

Once:

1. testing is cleaned up
2. Organize files, update package.json, and fix CommonJS bug #1 is ported

Would like to deprecate this repo:

1. make pulls on https://www.npmjs.com/browse/depended/classlist-polyfill moving them upstream
2. close shop & npm deprecate