Create associated packages for the dart:collection and dart:async libs.

pkg/collection_helpers/lib/all.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-/**
- * Exports all the individual parts of the collection-helper library.
- *
- * The sub-libraries of this package are:
- *
- * - `algorithms.dart`: Algorithms that work on lists (shuffle, binary search
- *                      and various sorting algorithms).
- * - `equality.dart`: Different notions of equality of collections.
- * - `typed_buffers.dart`: Growable typed data lists.
- * - `wrappers.dart`: Wrapper classes that delegate to a collection object.
- *                    Includes unmodifiable views of collections.
- */
+@deprecated
 library dart.collection_helper;
 
 export "algorithms.dart";
 export "equality.dart";
 export "typed_buffers.dart";
 export "wrappers.dart";