Add ensureSlide public function,

if you pass it the index of an item it will ensure that the page with that item on it is visible, useful with a responsive carousel, when you want to slide to a specific item.

My use case was 

    var ds = $('#dateSlider').bxSlider({
        speed: 400,
        minSlides: 2,
        maxSlides: 6,
        slideWidth: 130,
        slideMargin: 0,
        pager: false,
        infiniteLoop: false,
        hideControlOnEnd: true  
    });
    
    ds.ensureSlide($("#dateSlider li.selected").index());