draeton/Function.prototype.tail.js

## Function.prototype.tail.js
Function.prototype.tail = function (cb) {
  var fn = this;
  return function () {
    var ret = fn.apply(this, arguments);
    return cb ? cb.apply(this, [].concat(ret)): ret;
  };
};
	Function.prototype.tail = function (cb) {
	var fn = this;
	return function () {
	var ret = fn.apply(this, arguments);
	return cb ? cb.apply(this, [].concat(ret)): ret;
	};
	};