Would be nice to have a property for a animation on scrolling past the object

Thanks for this, it's really effective and simple to use.

It would be great if there was a way to animate when scrolling past an object so that we could use the exit animations from https://daneden.github.io/animate.css/

I'm thinking something like an "animateOut" property...

I see you've stopped work on it though. Mind if I look into it and create a pull request?