History not working

[calvinmetcalf]

So I was unable to get this working with my browser history, i.e. couldn't hit back button to go to the previous zoom, so I did the logical thing and rewrote my fork to use pushState for modern browsers and onhashchange for middle-aged browsers and the watching method you had for ancient browsers, in CoffeeScript.

I'm not sure if this is the direction you want to go but if it is I can always port some of this back to javascript.

working demo