Roll Observatory packages and add a roll script

packages/quiver/test/async/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.
 
-/**
- * Simple code with broad use cases.
- */
-library quiver.core;
+library quiver.async.all_tests;
 
-part 'src/core/hash.dart';
-part 'src/core/optional.dart';
+import 'countdown_timer_test.dart' as countdown_timer;
+import 'create_timer_test.dart' as create_timer;
+import 'future_group_test.dart' as future_group;
+import 'future_stream_test.dart' as future_stream;
+import 'iteration_test.dart' as iteration;
+import 'metronome_test.dart' as metronome;
+import 'stream_router_test.dart' as stream_router;
 
-/**
- * Returns the first non-null argument. If all arguments are null, throws
- * an [ArgumentError].
- *
- * Note: if [o1] is an [Optional], this can be accomplished with `o1.or(o2)`.
- */
-firstNonNull(o1, o2, [o3, o4]) {
-  if (o1 != null) return o1;
-  if (o2 != null) return o2;
-  if (o3 != null) return o3;
-  if (o4 != null) return o4;
-  throw new ArgumentError('All arguments were null');
+main() {
+  countdown_timer.main();
+  create_timer.main();
+  future_group.main();
+  future_stream.main();
+  metronome.main();
+  iteration.main();
+  stream_router.main();
 }