Correct typo in README
Add 'testling' script

Makes it possible to 'npm run testling' to run the tests in a headless browser.
Improve polyfill

setTimeout-based polyfill now closely follows the W3 proposal found at
http://www.w3.org/TR/animation-timing/
Move polyfill to index.js

This change is backwards incompatible and changes this module from a
requestAnimationFrame event-emitter to a requestAnimationFrame polyfill
New test suite for polyfill
Update README and package.json

Fixes #9
change to polyfill library
1.0.0