prioritize closing preview when ESC is pressed
foundation for playback component
group feature detection results in 'features' object, test for canvas and requestAnimationFrame
functional playback control for auto sliding
auto-slide playback updates, fix tap action, hide during overview
support moz and webkit prefixed requestAnimationFrame
minor tweaks and comments
add auto-slide instructions to readme
fix playback controls in ie10
fix css syntax error
replay when auto-slide controls are clicked on last slide