Material light and dark themes for Sky widgets

sky/examples/stocks2/lib/stock_app.dart

Index: sky/examples/stocks2/lib/stock_app.dart
diff --git a/sky/examples/stocks2/lib/stock_app.dart b/sky/examples/stocks2/lib/stock_app.dart
index 27c15effb6461658fb72d8b2606251270fde998e..7f319ec0c4dfbd9da8766055ddaf57aaacc3c0d1 100644
--- a/sky/examples/stocks2/lib/stock_app.dart
+++ b/sky/examples/stocks2/lib/stock_app.dart
@@ -5,7 +5,6 @@
 import 'package:sky/rendering/sky_binding.dart';
 import 'package:sky/theme/colors.dart' as colors;
 import 'package:sky/theme/theme_data.dart';
-import 'package:sky/theme/typography.dart' as typography;
 import 'package:sky/widgets/basic.dart';
 import 'package:sky/widgets/navigator.dart';
 import 'package:sky/widgets/theme.dart';
@@ -51,7 +50,10 @@ class StocksApp extends App {
 
   Widget build() {
     return new Theme(
-      data: new ThemeData(color: colors.Purple, text: typography.white),
+      data: new ThemeData.light(
+        primary: colors.Purple,
+        accent: colors.RedAccent,
+        darkToolbar: true),
       child: new Navigator(_navigationState)
     );
   }