Add eventing docs to readme
Add eventing docs to readme

givanse/backburner.js,greyhwndz/backburner.js,ebryn/backburner.js,BackburnerJS/backburner.js,greyhwndz/backburner.js,ebryn/backburner.js,BackburnerJS/backburner.js,givanse/backburner.js,BackburnerJS/backburner.js