Callbacks now get executed in the context of the trackerDictionary

Author: fblundun

src/js/in_queue.js

@@ -150,12 +150,9 @@
 				// Arguments is not an array, so we turn it into one
 				input = Array.prototype.shift.call(parameterArray);
 
-				// Custom callback rather than tracker method, called for each named tracker
+				// Custom callback rather than tracker method, called with trackerDictionary as the context
 				if (lodash.isFunction(input)) {
-					var allNamedTrackers = getNamedTrackers()
-					for (j = 0; j < allNamedTrackers.length; j++) {
-						input.apply(allNamedTrackers[j], parameterArray);
-					}
+					input.apply(trackerDictionary, parameterArray);
 					continue;
 				}