Ok, there is a problem here, slider resets to initial first slide after resize event, activeSlide is also required. Change it to this and pull again:
<pre>
_this.realIndex = _this.activeSlide =  params.initialSlide;
			if (_this.params.loop) {
				_this.activeSlide = _this.realIndex-params.slidesPerSlide
			}	
</pre>