touch/swipe is not supported in responsive slider (Yet?!)
(fine tune regular slide transition)
display screen size in the top left

(good for testin' out responsive)
disable slide buttons on transitionend (instead)

my first approach was to disable them (so you cant spam clicks) on animationend,
but on small screen sizes animations do not run in Webkit because the
wrap-around-the-screen carousel thing on the left and run are not on the screen (?)

but on Firefox animationend seems to fire

basically, its a different stab at ea2141a6f7