title: Can ionic2's pages support nested directory structure?
body: <p>I see the <code>pages</code> directory of many Ionic 2 projects is a flatted structure like below (if we use its generation command, the generated directory structure is flatted).</p>
  
  <p>e.g.</p>
  
  <pre><code>    pages/
        |- login/
        |    |-login.html
        |    |-login.scss
        |    |_login.ts
        |- logout/
        |    |-logout.html
        |    |-logout.scss
        |    |_logout.ts
        |- order-list/
        |    |-order-list.html
        |    |-order-list.scss
        |    |_order-list.ts
        |- order-detail/
        |    |-order-detail.html
        |    |-order-detail.scss
        |    |_order-detail.ts 
  </code></pre>
  
  <p>But if a project includes many pages, i hope the <code>pages</code> directory supports sub directories like below:</p>
  
  <p>e.g.</p>
  
  <pre><code>    pages/
        |- auth/
        |     |- login/
        |     |    |-login.html
        |     |    |-login.scss
        |     |    |_login.ts
        |     |- logout/
        |     |    |-logout.html
        |     |    |-logout.scss
        |     |    |_logout.ts
        |- order/
        |     |- list/
        |     |    |-list.html
        |     |    |-list.scss
        |     |    |_list.ts
        |     |- detail/
        |     |    |-detail.html
        |     |    |-detail.scss
        |     |    |_detail.ts
  </code></pre>
  
  <p>Does Ionic 2's <code>pages</code> support this? The same question to others directory like <code>providers</code> and <code>pipes</code>.</p>