added reset function

call reset function before populating timeline with new data (before calling my_timeline_obj.init(my_timeline_config);)

example 

make global:
var timeline_config, storyjs_embedjs;

//in your init function :
if (storyjs_embedjs === undefined) {
    storyjs_embedjs = new VMM.Timeline('my-timeline', '100%', '100%');
    storyjs_embedjs.init(timeline_config);
} else {
    storyjs_embedjs.reset();
    storyjs_embedjs.init(timeline_config);
}

source/js/VMM.Timeline.js

@@ -449,7 +449,12 @@ if(typeof VMM != 'undefined' && typeof VMM.Timeline == 'undefined') {
 			slider.setSlide(0);
 			timenav.setMarker(0, config.ease,config.duration);
 		};
-		
+		//call this function before
+		this.reset = function() {
+			config.current_slide = 0;
+			slider.setSlide(0);
+			timenav.setMarker(0, config.ease,config.duration);
+		}
 		/* DATA 
 		================================================== */
 		function getData(url) {