pollyfills.js

function isRelatedTo (o1, o2) { 
  function F() {}
  F.prototype = o2
  return o1 instanceof F
}

if (!Object.create) {
  Object.create = function(o) {
    function F(){}
    F.prototype = o;
    return new F();
  }
}  

if (!Object.is) {
	Object.is = function(v1, v2) {
		// test for `-0`
		if (v1 === 0 && v2 === 0) {
			return 1 / v1 === 1 / v2;
		}
		// test for `NaN`
		if (v1 !== v1) {
			return v2 !== v2;
		}
		// everything else
		return v1 === v2;
	};
}

if (!Date.now) {
  Date.now = function(){
    return (new Date()).getTime();
  };
}