Rename AppView to SkyBinding.

sky/examples/game/main.dart

 import 'dart:sky';
+
+import 'package:sky/widgets/basic.dart';
+import 'package:sky/widgets/raised_button.dart';
+import 'package:sky/widgets/widget.dart';
+
 import 'lib/game_demo.dart';
 import 'lib/sprites.dart';
-import 'package:sky/widgets/basic.dart';
-import 'package:sky/app/view.dart';
-import 'package:sky/widgets/ui_node.dart';
-import 'package:sky/widgets/raised_button.dart';
-
-AppView app;
 
 void main() {
   // Load images
   new ImageMap([
       "https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/resources-auto/BurnTexture.png",
       "https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources-auto/asteroid_big_002.png",
       "https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources-auto/GG_blueship_Lv3.png",
       "https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources-auto/laserBlue.png",
       "https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources-auto/laserFlashPurple.png",
       "https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Source/Resources/NebulaClouds.png",
     ],
     allLoaded);
 }
 
 void allLoaded(ImageMap loader) {
   _loader = loader;
   runApp(new GameDemoApp());
 }
 
 class GameDemoApp extends App {
 
-  UINode build() {
+  Widget build() {
     return new Stack([
       new GameDemo(),
 //      new StackPositionedChild(
 //        new Flex([
 //          new FlexExpandingChild(
 //            new RaisedButton(child:new Text("Hello")),
 //            key: 1
 //          ),
 //          new FlexExpandingChild(
 //            new RaisedButton(child:new Text("Foo!")),
 //            key: 2
 //          )
 //        ]),
 //        right:0.0,
 //        top: 20.0
 //      )
     ]);
   }
 }
 
 ImageMap _loader;
 
 class GameDemo extends OneChildRenderObjectWrapper {
 
-  GameDemo({ UINode child, Object key })
+  GameDemo({ Widget child, Object key })
   : super(child: child, key: key);
 
   GameDemoBox get root { return super.root; }
   GameDemoBox createNode() => new GameDemoBox(new GameDemoWorld(_loader));
-}
+}