Use this bookmarklet to un-cripple the page (from [1]):

  javascript:document.querySelector('meta[name=viewport]')
    .setAttribute('content','
      width=device-width,
      initial-scale=1.0,
      maximum-scale=10.0,
      user-scalable=1
    ');

Shame on the author to force users to retort to hacks like this, by the way. "B-but you can click on the images!" is not an answer, damn it [2]. Pinch-and-zoom is arguably the premier feature/innovation of the post-iOS era, for you geniuses to disable it for whatever UI/UX cargo-culting fad is going through your head. Seriously. Just stop [3].

[1] http://apple.stackexchange.com/questions/28391/how-can-i-for...

[2] https://news.ycombinator.com/item?id=8468745

[3] http://motherfuckingwebsite.com/