SkyDemo should use explicit intents

sky/sdk/home.dart

Index: sky/sdk/home.dart
diff --git a/sky/sdk/home.dart b/sky/sdk/home.dart
index c3c37f2a964c389d5fd012f9ad0e0941c5c42569..782648134b5a67588371760e19e3c3dac7f6d551 100644
--- a/sky/sdk/home.dart
+++ b/sky/sdk/home.dart
@@ -21,11 +21,14 @@ import 'package:sky/widgets/tool_bar.dart';
 
 void launch(String relativeUrl) {
   Uri url = Uri.base.resolve(relativeUrl);
-  url = url.replace(scheme: 'sky');
 
   ActivityManagerProxy activityManager = new ActivityManagerProxy.unbound();
+  ComponentName component = new ComponentName()
+    ..packageName = 'org.domokit.sky.demo'
+    ..className = 'org.domokit.sky.demo.SkyDemoActivity';
   Intent intent = new Intent()
     ..action = 'android.intent.action.VIEW'
+    ..component = component
     ..url = url.toString();
   shell.requestService(null, activityManager);
   activityManager.ptr.startActivity(intent);