Roll Observatory packages and add a roll script

packages/quiver/test/iterables/all_tests.dart

Index: packages/quiver/test/iterables/all_tests.dart
diff --git a/packages/quiver/test/iterables/all_tests.dart b/packages/quiver/test/iterables/all_tests.dart
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+++ b/packages/quiver/test/iterables/all_tests.dart
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+// Copyright 2013 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.
+
+library quiver.iterables.all_tests;
+
+import 'concat_test.dart' as concat;
+import 'count_test.dart' as count;
+import 'cycle_test.dart' as cycle;
+import 'enumerate_test.dart' as enumerate;
+import 'merge_test.dart' as merge;
+import 'min_max_test.dart' as min_max;
+import 'partition_test.dart' as partition;
+import 'generating_iterable_test.dart' as generating_iterable;
+import 'range_test.dart' as range;
+import 'zip_test.dart' as zip;
+
+main() {
+  concat.main();
+  count.main();
+  cycle.main();
+  enumerate.main();
+  merge.main();
+  min_max.main();
+  partition.main();
+  generating_iterable.main();
+  range.main();
+  zip.main();
+}