[Effen] s/Node/UINode/, s/Element/WrapperNode/, s/EventTarget/EventListenerNode/

sky/sdk/README.md

 Sky
 ===
 
 Sky is an experimental, high-performance UI framework for mobile apps. Sky helps
 you create apps with beautiful user interfaces and high-quality interactive
 design that run smoothly at 120 Hz.
 
 Sky consists of two components:
 
 1. *The Sky engine.* The engine is the core of the system. Written in C++, the
@@ skipping 14 matching lines @@
 
 Examples
 --------
 
 The simplest Sky app is, appropriately, HelloWorldApp:
 
 ```dart
 import 'package:sky/framework/fn.dart';
 
 class HelloWorldApp extends App {
-  Node build() {
+  UINode build() {
     return new Text('Hello, world!');
   }
 }
 
 void main() {
   new HelloWorldApp();
 }
 ```
 
 Execution starts in `main`, which creates the `HelloWorldApp`. The framework
 then marks `HelloWorldApp` as dirty, which schedules it to build during the next
 animation frame. Each animation frame, the framework calls `build` on all the
-dirty components and diffs the virtual `Node` hierarchy returned this frame with
+dirty components and diffs the virtual `UINode` hierarchy returned this frame with
 the hierarchy returned last frame. Any differences are then applied as mutations
 to the physical heiarchy retained by the engine.
 
 For more examples, please see the [examples directory](examples/).
 
 Services
 --------
 
 Sky apps can access services from the host operating system using Mojo. For
 example, you can access the network using the `network_service.mojom` interface.
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 3. Using a USB cable, plug your phone into your computer. If prompted on your
    device, authorize your computer to access your device.
 
 Running a Sky application
 -------------------------
 
 1. ``packages/sky/lib/sky_tool --install examples/stocks/main.sky``
    The --install flag is only necessary the first time to install SkyDemo.apk.
 
 2.  Use ``adb logcat`` to view any errors or Dart print() output from the app.