title: Authenticate employee in module front controller ajax actions
body: <p>In Prestashop 1.5 I need to grant the permission to execute some ajax actions in module front controller only to employee. </p>
  
  <pre><code>Context::getContext()-&gt;employee
  </code></pre>
  
  <p>is only available in admin context, so in module front controllers is always null.</p>
  
  <p>How I should autenticate an employee in module front controllers context?</p>