Roll Observatory packages and add a roll script

packages/quiver/test/core/all_tests.dart

 // 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.cache;
+library quiver.core.all_tests;
 
-import 'dart:async';
-import 'dart:collection';
+import 'core_test.dart' as core;
+import 'hash_test.dart' as hash;
+import 'optional_test.dart' as optional;
 
-import 'package:quiver/collection.dart' show LruMap;
-
-part 'src/cache/cache.dart';
-part 'src/cache/map_cache.dart';
+main() {
+  core.main();
+  hash.main();
+  optional.main();
+}