Move sky/examples to sky/sdk/lib/example, and code changes to support that change. Fixes T277.

sky/sdk/lib/example/raw/launcher.dart

Index: sky/sdk/lib/example/raw/launcher.dart
diff --git a/sky/examples/raw/launcher.dart b/sky/sdk/lib/example/raw/launcher.dart
similarity index 95%
rename from sky/examples/raw/launcher.dart
rename to sky/sdk/lib/example/raw/launcher.dart
index bd12134b2c3c318f796303a7c6fd6b63b90b1618..69625cae4c979464347fd3145023571eccd6cbbc 100644
--- a/sky/examples/raw/launcher.dart
+++ b/sky/sdk/lib/example/raw/launcher.dart
@@ -35,7 +35,7 @@ bool handleEvent(Event event) {
     ActivityManagerProxy activityManager = new ActivityManagerProxy.unbound();
     Intent intent = new Intent()
       ..action = 'android.intent.action.VIEW'
-      ..url = 'sky://localhost:9888/sky/examples/raw/hello_world.dart';
+      ..url = 'sky://localhost:9888/sky/sdk/lib/example/raw/hello_world.dart';
     shell.requestService(null, activityManager);
     activityManager.ptr.startActivity(intent);
     return true;