title: Access static variable in symfony 2.2 twig
body: <p>I have a class containing constant options in array form:</p>
  
  <pre><code>namespace MyNameSpace;
  
  class OptionConstants
  {
    /**
     * Gender options
     */
     public static $GENDER = array(
      'Male',
      'Female'
     );
  
    /**
     * University year levels
     */
     public static $UNVERSITY_STANDING = array(
      '--None--',
      'First Year',
      'Second Year',
      'Third Year',
      'Fourth Year',
      'Graduate Student',
      'Graduated',
      'Other'
     );
  }
  </code></pre>
  
  <p>How can I access $UNVERSITY_STANDING or $GENDER in symfony 2.2 twig?</p>