Roll Observatory packages and add a roll script

packages/quiver/test/testing/all_tests.dart

 // Copyright 2014 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-/**
- * Utilities for testing the equality of Dart object
- */
-library quiver.testing.equality;
+library quiver.testing.all_tests;
 
-import 'package:matcher/matcher.dart';
-import 'package:quiver/iterables.dart';
+import 'async/all_tests.dart' as async;
+import 'equality/all_tests.dart' as equality;
 
-part 'src/equality/equality.dart';
+main() {
+  async.main();
+  equality.main();
+}