title: Add additional data to template of FOS User Bundle
body: <p>How can I add additional data to the templates of the FOS User Bundle?
  I know how to customize the form fields and how to react to the FOS User Bundle events to hook into the form evaluation process - but I don't get how to pass more arguments to the templates then the pure forms.</p>
  
  <p>A.e. I need to pass a variable into the registration template.</p>
  
  <p>Any help is very welcome.</p>
  
  <p>Thanks a lot.</p>