First group of routing examples

example/angular/routing/accessing_route_params_within_components/book_component.dart

Index: example/angular/routing/accessing_route_params_within_components/book_component.dart
diff --git a/example/angular/routing/accessing_route_params_within_components/book_component.dart b/example/angular/routing/accessing_route_params_within_components/book_component.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.
+
+library book_component;
+
+import 'package:angular/angular.dart';
+import 'book.dart' show Book;
+
+@NgComponent(
+    selector: 'book-component',
+    templateUrl: './book_component.html',
+    publishAs: 'cmp'
+)
+class BookComponent {
+  @NgTwoWay('book-map')
+  Map<String, Book> bookMap;
+  String _bookId;
+
+  BookComponent(RouteProvider routeProvider) {
+    _bookId = routeProvider.parameters['bookId'];
+  }
+
+  Book get book => bookMap[_bookId];
+}