Add swipe support

@mediapal
I'm using it as well and experience the same issues under Firefox.

To make the Carousel swipeable I use the following:

1. Add swipe library to theme:

https://github.com/stephband/jquery.event.move
https://github.com/stephband/jquery.event.swipe
2. Use click functions (for the lack of better documentation):

var jcarousel = $('.jcarousel-wrapper');
            jcarousel.on('swipeleft', function(){
                $(this).find('.jcarousel-control-next').click();
            });
            jcarousel.on('swiperight', function(){
                $(this).find('.jcarousel-control-prev').click();
            });
            // If the movestart is heading off in an upwards or downwards direction, prevent it so that the browser scrolls normally.
            jcarousel.on('movestart', function(e) {
              if ((e.distX > e.distY && e.distX < -e.distY) ||
                  (e.distX < e.distY && e.distX > -e.distY)) {
                e.preventDefault();
              }
            });

I think both, a touchmove library dependency and extended documentation, should be added for a first alpha version of the module. We could improve the touch device UX by adding a touch move function and move the slides with position relative and left/right properties accordingly.