even when stubbing out the function for testing, this $.fn needs to return this (it's relied upon for chaining in nav)

tests/unit/navigation/navigation_transitions.js

@@ -54,6 +54,7 @@
 			//stub to prevent class removal
 			$.fn.animationComplete = function(callback){
 				callbackQueue.unshift(callback);
+				return this;
 			};
 
 			clearPageTransitionStack();