fixed animation race condition bug that sometimes produced multiple requestAnimFrame calls, and also changed throttle property to be in fps (it used to be in ms). This will make it more consistent with other properties related to frame rates

tests/js/Test.js

@@ -10,7 +10,7 @@ function log(message) {
  * Test constructor
  */
 function Test() {
-    this.testOnly = 'SHAPES - add sprite';
+    this.testOnly = '';
     this.counter = 0;
 }
 /**