fixed missing this

lib/network/Network.js

@@ -2260,7 +2260,7 @@ Network.prototype._initializeMixinLoaders = function () {
  */
 Network.prototype.storePosition = function() {
   console.log("storePosition is depricated: use .storePositions() from now on.")
-  storePositions();
+  this.storePositions();
 };
 
 /**