Add animateFinished event fired on animations finishing

src/js/pannellum.js

@@ -1372,6 +1372,7 @@ function animate() {
     } else if (renderer && (renderer.isLoading() || (config.dynamic === true && update))) {
         requestAnimationFrame(animate);
     } else {
+        fireEvent('animateFinished', {pitch: _this.getPitch(), yaw: _this.getYaw(), hfov: _this.getHfov()});
         animating = false;
         prevTime = undefined;
         var autoRotateStartTime = config.autoRotateInactivityDelay -