for backward compatibility reasons, IE11 sets both msPointerEnabled and
pointerEnabled. Changed the order for the test and added 'else if' to
not duplicate handlers on pointer events

Added un-prefixed touch-action CSS attribute
added un-prefixed PointerEvents event handler hooks

use 'url()'-free path when specifying parallax image, refactor so that parallax is applied to background class, remove unused attributes #595

modified:   css/reveal.min.css
modified:   plugin/leap/leap.js

modified:   css/reveal.css
modified:   css/reveal.min.css
modified:   plugin/leap/leap.js