This call to _reset makes sure all inline-styles and classes added/changed to all elements parsed by skrollr will be remembered for future undone, if you remove that line and then try a `destroy` you will notice that many elements will have with an `undefined` class after destroying. That's because it seems that when trying to call `_reset` with the `undo` parameter some elements doesn't have their `dirtyStyleAttr` and `dirtyClassAttr` properties.

I'm leaving it there until I found the