Roll Observatory packages and add a roll script

packages/charted/test.disabled/charts/renderers/renderer_test.dart

+/*
+ * Copyright 2015 Google Inc. All rights reserved.
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
+library charted.renderer.test;
+
+import 'bar_chart_renderer_test.dart' as bar;
+import 'line_chart_renderer_test.dart' as line;
+import 'pie_chart_renderer_test.dart' as pie;
+import 'stackedbar_chart_renderer_test.dart' as stacked_bar;
+
+rendererTests() {
+  bar.main();
+  line.main();
+  pie.main();
+  stacked_bar.main();
+}
+