Roll Observatory packages and add a roll script

packages/charted/test.disabled/scale/scale_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.scale;
+
+import 'package:charted/core/utils.dart';
+import 'package:charted/interpolators/interpolators.dart';
+import 'package:charted/locale/locale.dart';
+import 'package:charted/scale/scale.dart';
+import 'package:unittest/unittest.dart';
+
+part 'linear_scale_test.dart';
+part 'log_scale_test.dart';
+part 'ordinal_scale_test.dart';
+part 'scale_util_test.dart';
+part 'time_scale_test.dart';
+
+scaleTests() {
+  testScaleUtil();
+  testLinearScale();
+  testLogScale();
+  testOrdinalScale();
+  testTimeScale();
+}