Roll Observatory packages and add a roll script

quiver/lib/cache.dart

Index: quiver/lib/cache.dart
diff --git a/quiver/lib/cache.dart b/quiver/lib/cache.dart
deleted file mode 100644
index b962bcead54cc55a96ea931bd27450f592b0a4f1..0000000000000000000000000000000000000000
--- a/quiver/lib/cache.dart
+++ /dev/null
@@ -1,23 +0,0 @@
-// 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;
-
-import 'dart:async';
-import 'dart:collection';
-
-import 'package:quiver/collection.dart' show LruMap;
-
-part 'src/cache/cache.dart';
-part 'src/cache/map_cache.dart';