Add collection-helpers library.

pkg/collection_helpers/lib/all.dart

Index: pkg/collection_helpers/lib/all.dart
diff --git a/pkg/collection_helpers/lib/all.dart b/pkg/collection_helpers/lib/all.dart
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+// 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).
+ * - `wrappers.dart`: Wrapper classes that delegate to a collection object.
+ * - `equality.dart`: Different notions of equality of collections.
+ */
+library dart.collection_helper;
+
+export "algorithms.dart";
+export "wrappers.dart";
+export "equality.dart";