Update to not use _mountImage

See facebook/react#852.

Author: sophiebits

src/ReactART.js

@@ -109,10 +109,11 @@ var ContainerMixin = merge(ReactMultiChild.Mixin, {
    * Creates a child component.
    *
    * @param {ReactComponent} child Component to create.
+   * @param {object} childNode ART node to insert.
    * @protected
    */
-  createChild: function(child) {
-    var childNode = child._mountImage;
+  createChild: function(child, childNode) {
+    child._mountImage = childNode;
     var mostRecentlyPlacedChild = this._mostRecentlyPlacedChild;
     if (mostRecentlyPlacedChild == null) {
       // I'm supposed to be first.
@@ -140,6 +141,7 @@ var ContainerMixin = merge(ReactMultiChild.Mixin, {
    */
   removeChild: function(child) {
     child._mountImage.eject();
+    delete child._mountImage;
   },
 
   /**