Roll Observatory packages and add a roll script

quiver/lib/testing/equality.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;
-
-import 'package:matcher/matcher.dart';
-import 'package:quiver/iterables.dart';
-
-part 'src/equality/equality.dart';