Numbers the images in imgur albums, so it's easier to reference them as #X in the comment section
This isn't as trivial as you might think: imgur's infinite scroll means that only a few images actually "exist" in the DOM at any one time, so it's not as simple as just counting how many images are there. Instead this keeps count as you scroll.
If you scroll too fast, it may get confused. If that happens, scroll back up and it should fix itself.
