Better method of generating thumbnails

[Fortyseven]

Instead of generating thumbnails when the page is loaded, instead have a separate code path dedicated to generating a thumbnail.

So like, index.php?thumb=filename.gif, and generate/return inside the <img> tag. This way if a directory doesn't have all it's thumbs created yet, it won't block the browser loading the page itself.

• This will result in a ton of index.php calls, but this not intended to be a high-performance, slick-ass gallery app, so YOLO.