title: How does Sonata Admin 2.3 load assets?
body: <p>In the new standard_layout template, javascripts are loaded like this:</p>
  
  <pre><code>{% for javascript in admin_pool.getOption('javascripts', []) %}
  </code></pre>
  
  <p>It seems <code>admin_pool</code> is a service in the DI container and is defined in this file : <code>Sonata\AdminBundle\Admin\Pool.php</code>.</p>
  
  <p>What responsibilities does the <code>admin_pool</code> service have and how does it load assets? I'm looking for a detailed explanation of the execution flow from the above twig statement to the loading of the actual (e.g. javascript) assets from disk.</p>