Initial support for album browsing from UI

ui/src/App.js

@@ -3,7 +3,7 @@ import React from 'react'
 import { Admin, Resource } from 'react-admin'
 import dataProvider from './dataProvider'
 import authProvider from './authProvider'
-import { Login } from './layout'
+import { Login, Layout } from './layout'
 import user from './user'
 import song from './song'
 import album from './album'
@@ -12,10 +12,11 @@ const App = () => (
   <Admin
     dataProvider={dataProvider}
     authProvider={authProvider}
+    layout={Layout}
     loginPage={Login}
   >
-    <Resource name="song" {...song} />
-    <Resource name="album" {...album} />
+    <Resource name="song" {...song} options={{ subMenu: 'library' }} />
+    <Resource name="album" {...album} options={{ subMenu: 'library' }} />
     <Resource name="user" {...user} />
   </Admin>
 )