title: Angular custom preloadingStrategy
body: <p>I want to customize preloading strategy by routes.</p>
  <p>For example:</p>
  <p>when I'm in login page I want to load only the login module.</p>
  <p>After The login -</p>
  <ol>
  <li>If admin preload all the modules that are connected to the admin modules.</li>
  <li>If user preload all the modules that are connected to the user modules.</li>
  </ol>
  <ul>
  <li>All the examples that I found is CustomPreloadingStrategy service that used routes data -  <code>data: { preload: true, delay: true }</code> but its not answer my needs.</li>
  </ul>