Roll Observatory packages and add a roll script

packages/charted/test.disabled/svg/svg_test.dart

+/*
+ * Copyright 2014 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.test.svg;
+
+import 'dart:async';
+import 'dart:html' show document, Element;
+import 'package:charted/core/utils.dart';
+import 'package:charted/scale/scale.dart';
+import 'package:charted/selection/selection.dart';
+import 'package:charted/svg/svg.dart';
+import 'package:charted/interpolators/interpolators.dart';
+import 'package:unittest/unittest.dart';
+
+part 'svg_arc_test.dart';
+part 'svg_axis_test.dart';
+part 'svg_line_test.dart';
+
+svgTests() {
+  testSvgArc();
+  testSvgAxis();
+  testSvgLine();
+}