introduce ObservableList.listChanges to keep list changes separate from property changes

pkg/template_binding/lib/template_binding.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.
 
 /**
  * This library provides access to the Polymer project's
  * [Data Binding](http://www.polymer-project.org/docs/polymer/databinding.html)
  * Find more information at the
  * [Polymer.dart homepage](https://www.dartlang.org/polymer-dart/).
  *
  * Extends the capabilities of the HTML Template Element by enabling it to
  * create, manage, and remove instances of content bound to data defined in
  * Dart.
  *
  * Node.bind() is a new method added to all DOM nodes which instructs them to
  * bind the named property to the data provided. These allows applications to
  * create a data model in Dart or JavaScript that DOM reacts to.
  */
 library template_binding;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:html';
 import 'dart:svg' show SvgSvgElement;
 import 'package:observe/observe.dart';
 
 import 'src/binding_delegate.dart';
 import 'src/node_binding.dart';
-import 'src/list_diff.dart' show calculateSplices, ListChangeDelta;
 
 export 'src/binding_delegate.dart';
 export 'src/node_binding.dart' show NodeBinding;
 
 part 'src/element.dart';
 part 'src/input_bindings.dart';
 part 'src/input_element.dart';
 part 'src/instance_binding_map.dart';
 part 'src/node.dart';
 part 'src/select_element.dart';
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 // The expando for storing our MDV extensions.
 //
 // In general, we need state associated with the nodes. Rather than having a
 // bunch of individual expandos, we keep one per node.
 //
 // Aside from the potentially helping performance, it also keeps things simpler
 // if we decide to integrate MDV into the DOM later, and means less code needs
 // to worry about expandos.
 final Expando _expando = new Expando('template_binding');