v1.3.35

Fixed issue with appropriate movement direction while only 2 slides are
present. Tested vs autoSlide, keyboardControls,
navNextSelector/navPrevSelector, nextSlide/prevSlide methods
update gitignore
Working on issue #327
Ref issue #327: applied hardware acceleration buffering to slides. Introduced new setting 'hardwareAccelBuffer', default value is 5
updated demo
Fix from master