Reorganize mdv and observe packages

pkg/mdv/test/binding_syntax_test.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.
 
 library binding_syntax_test;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:html';
-import 'package:mdv_observe/mdv_observe.dart';
+import 'package:mdv/mdv.dart' as mdv;
+import 'package:observe/observe.dart';
 import 'package:unittest/html_config.dart';
 import 'package:unittest/unittest.dart';
-import 'mdv_observe_utils.dart';
+import 'observe_utils.dart';
 
 // Note: this file ported from
 // https://github.com/toolkitchen/mdv/blob/master/tests/syntax.js
 
 main() {
+  mdv.initialize();
   useHtmlConfiguration();
   group('Syntax', syntaxTests);
 }
 
 syntaxTests() {
   var testDiv;
 
   setUp(() {
     document.body.append(testDiv = new DivElement());
   });
@@ skipping 224 matching lines @@
 class TimesTwoSyntax extends CustomBindingSyntax {
   getBinding(model, path, name, node) {
     path = path.trim();
     if (!path.startsWith('2x:')) return null;
 
     path = path.substring(3);
     return new CompoundBinding((values) => values['value'] * 2)
         ..bind('value', model, path);
   }
 }