Reorganize mdv and observe packages

pkg/mdv/lib/src/text.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
-// WARNING: Do not edit - generated code.
+part of mdv;
 
-part of $LIBRARYNAME;
+/** Extensions to the [Text] API. */
+class _TextExtension extends _NodeExtension {
+  _TextExtension(Text node) : super(node);
 
-$(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
-  factory $CLASSNAME(String data) => document.$dom_createTextNode(data);
-$!MEMBERS
+  Text get node => super.node;
 
-$if DART2JS
-  @Creates('Null')  // Set from Dart code; does not instantiate a native type.
-$endif
   StreamSubscription _textBinding;
 
-  @Experimental
   void bind(String name, model, String path) {
     if (name != 'text') {
       super.bind(name, model, path);
       return;
     }
 
     unbind('text');
 
     _textBinding = new PathObserver(model, path).bindSync((value) {
-      text = value == null ? '' : '$value';
+      node.text = value == null ? '' : '$value';
     });
   }
 
-  @Experimental
   void unbind(String name) {
     if (name != 'text') {
       super.unbind(name);
       return;
     }
 
     if (_textBinding == null) return;
 
     _textBinding.cancel();
     _textBinding = null;
   }
 
-  @Experimental
   void unbindAll() {
     unbind('text');
     super.unbindAll();
   }
 }