add optional config for owl

[landsman]

Change this to optional parameters:

            this.slider.owlCarousel({
                items:              1,
                nav:                true,
                navText:            [than.tplArrow('prev'), than.tplArrow('next')],
                autoHeight:         false,
                URLhashListener:    true,
                startPosition:      'URLHash',
                callbacks:          true,
                center:             true,
                lazyLoad:           true,
                autoplay:           false,
                dots:               false
            });