TODO.md

• We should handle the case where an hidden lazy image trigger onload after we unsubscribed Right now we do not restart listeners so that image will never be shown
• We could use this handy function for h/v offset checking

function elementInViewport(el) {
  var rect = el.getBoundingClientRect()
  return (
    rect.top + rect.height >= 0 &&
    rect.left + rect.width >= 0 &&
    rect.bottom - rect.height <= window.innerHeight &&
    rect.right - rect.width <= window.innerWidth
    )
}

• Add automated tests using casperjs
• Check for resize event
• Add IE6/IE7 support ? + Test
• Add "used by" section in README
• Provide fallback for users w/o JS ?