title: Imagefield in Inline formset not populated
body: <p>I have this piece of code:</p>
  
  <pre><code>vehicle = get_object_or_404(Vehicle, stock_number=stock_number)
  
  if request.method == 'POST':
      vehicle_form = VehicleForm(request.POST, instance=vehicle)
      photos = PhotosFormSet(request.POST, request.FILES, instance=vehicle)
      if vehicle_form.is_valid() and photos.is_valid():
          vehicle = vehicle_form.save()
          photos.save()
  
          request.user.message_set.create(message='The vehicle "%s" was edited
            successfully.' % vehicle.__str__())
          return HttpResponseRedirect("/vehicles/details/%s/" % stock_number)
  else:
      vehicle_form = VehicleForm(instance=vehicle)
      photos = PhotosFormSet(instance=vehicle)
  
  return render_to_response('vehicles/vehicles-add-edit.html',  
     {'vehicle_form':vehicle_form, 'photos': photos,}, 
     context_instance=RequestContext(request))
  </code></pre>
  
  <p>The forms are initialized correctly except the <code>ImageField</code> in <code>PhotosFormSet</code>.</p>