animation refactor

ionic/collide/collide.js

@@ -1,3 +1,5 @@
+/* Forked from Collide.js, MIT License. Julian Shapiro http://twitter.com/shapiro */
+
 import {dom} from 'ionic/util'
 
 
@@ -53,6 +55,17 @@ export let Collide = {
   /* Set to 1 or 2 (most verbose) to output debug info to console. */
   debug: false,
 
+  startTick: function() {
+    /* If the animation tick isn't running, start it.
+       Collide shuts it off when there are no active calls to process. */
+    if (Collide.State.isTicking === false) {
+      Collide.State.isTicking = true;
+
+      /* Start the tick loop. */
+      tick();
+    }
+  },
+
   /* initialize element data */
   initData: function(element) {
     element.$collide = {