Fix hasNext/hasPrev in underflow mode
Fix hasNext/hasPrev in underflow mode

burakkp/jcarousel,cssfirefly/jcarousel,npmcomponent/jsor-jcarousel,cssfirefly/jcarousel,mrkiwi/jcarousel,mrkiwi/jcarousel,Orehouse/jcarousel,Orehouse/jcarousel,nguyenuit/jcarousel,nguyenuit/jcarousel,jsor/jcarousel,jsor/jcarousel,stormwild/jcarousel,stormwild/jcarousel