Rationalize Dart mojo and sky package structure

sky/framework/components/menu_divider.dart

Index: sky/framework/components/menu_divider.dart
diff --git a/sky/framework/components/menu_divider.dart b/sky/framework/components/menu_divider.dart
deleted file mode 100644
index bfe4483af2b16dde25cc580a261b222b61bf41a1..0000000000000000000000000000000000000000
--- a/sky/framework/components/menu_divider.dart
+++ /dev/null
@@ -1,20 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import '../fn.dart';
-
-class MenuDivider extends Component {
-  static final Style _style = new Style('''
-    margin: 8px 0;
-    border-bottom: 1px solid rgba(0, 0, 0, 0.12);'''
-  );
-
-  MenuDivider({ Object key }) : super(key: key);
-
-  UINode build() {
-    return new Container(
-      style: _style
-    );
-  }
-}