Iterate on storage UI.

Support both grid and list view of documents.  Show breadcrumb
navigation trail in action bar.  Start supporting file and directory
creation.

Change-Id: I93a973da7b0d4387a57fe719e7bb20944adb0290
diff --git a/res/menu/activity.xml b/res/menu/activity.xml
new file mode 100644
index 0000000..c675fb8
--- /dev/null
+++ b/res/menu/activity.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2013 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item
+        android:id="@+id/menu_create_dir"
+        android:title="@string/menu_create_dir"
+        android:icon="@drawable/ic_menu_create_dir" />
+</menu>