sprint2

auto-bind.js
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			'use strict';

			var copy = require('es5-ext/object/copy')
			, map = require('es5-ext/object/map')
			, callable = require('es5-ext/object/valid-callable')
			, validValue = require('es5-ext/object/valid-value')

			, bind = Function.prototype.bind, defineProperty = Object.defineProperty
			, hasOwnProperty = Object.prototype.hasOwnProperty
			, define;

			define = function (name, desc, bindTo) {
			var value = validValue(desc) && callable(desc.value), dgs;
			dgs = copy(desc);
			delete dgs.writable;
			delete dgs.value;
			dgs.get = function () {
			if (hasOwnProperty.call(this, name)) return value;
			desc.value = bind.call(value, (bindTo == null) ? this : this[bindTo]);
			defineProperty(this, name, desc);
			return this[name];
			};
			return dgs;
			};

			module.exports = function (props/, bindTo/) {
			var bindTo = arguments[1];
			return map(props, function (desc, name) {
			return define(name, desc, bindTo);
			});
			};