Update docs
Fix events wrapper for IE8
Use PointerEvent if available
Update tests
Improve target Interactable resolution

Hovering over a selector Interactable and then moving directly to an
element which matched a selector Interactable whith no actions enabled
and was also an element Interactable would cause the previous selector
Interactable to remain targeted.
Fix a problem with event targets in IE8
Use GestureEvents for drag and resize sequence