Added support for scrolling to a target slide without animations

scrollToSlide(targetSlideNum, doAnimate);

Scrolling to the first slide can be done in different ways:
$('#mywrapper').trigger('scrollto.snappish', 0); // will scroll to slide 0 with animations
$('#mywrapper').trigger('scrollto.snappish', {targetSlideNum: 0}); // will scroll to slide 0 with animations
$('#mywrapper').trigger('scrollto.snappish', {targetSlideNum: 0, doAnimation: false}); // will scroll to slide 0 without animations