title: _ is undefined _.extend(Model.prototype, Events, { but it is in included file
body: <p>I have dowloaded backbone.js from <a href="http://documentcloud.github.com/backbone/" rel="nofollow">http://documentcloud.github.com/backbone/</a>, included that file inside script tag and create view in onReady function like <a href="http://documentcloud.github.com/backbone/#View" rel="nofollow">http://documentcloud.github.com/backbone/#View</a>
  but I always get message <strong>** _ is undefined  _.extend(Model.prototype, Events, {**</strong>
  but when I look in file _extend is there and path is 100% ok. Did anyone have same behavior ?</p>