5.2.1
update presentation examples move to root @ /examples
add test deck with 500 slides
fix issue where auto-animate did not work when jumping three or more slides (i.e. longer than the view distance)
add lightbox example to demo deck
fix broken asset urls in examples
Fix copy/paste-o
copy
bg videos remain muted on mobile, otherwise broken when navigating with swipe gestures
move highlight themes from lib/css/ to plugin/highlight/
polyfill element.closest for ie11