title: Additional fields not saving with Django-Registration
body: <p>I have been pulling my hair out for a couple of days trying to get additional fields such as first name and last name to save with Django Registration. I am getting the form fields to show up but after I submit the form, the additional fields don't save.  Please help me.  Thank you!</p>
  
  <p><strong>Models.py</strong></p>
  
  <pre><code>from django.db import models
  from django.utils.translation import ugettext_lazy as _
  from django.contrib.auth.models import User, Group
  from django.db.models.signals import post_save
  
  class UserProfile(models.Model):
      user = models.OneToOneField(User)  
      first_name = models.CharField(max_length=100)
      last_name = models.CharField(max_length=100)
  
  def create_user_profile(sender, instance, created, **kwargs):  
     if created:  
         profile, created = UserProfile.objects.get_or_create(user=instance)  
  
  post_save.connect(create_user_profile, sender=User) 
  </code></pre>
  
  <p><strong>Forms.py</strong></p>
  
  <pre><code>from django import forms
  from registration.forms import RegistrationForm
  from django.utils.translation import ugettext_lazy as _
  from MyRegistration.models import UserProfile
  from django.contrib.auth.models import User
  
  class UserRegistrationForm(RegistrationForm):
       first_name = forms.CharField(label=_('First Name'), max_length=30, required=True)
       last_name = forms.CharField(label=_('Last Name'), max_length=30)
  </code></pre>
  
  <p><strong>Regbackend.py</strong></p>
  
  <pre><code>from django.contrib.auth.models import User
  from MyRegistration.forms import UserRegistrationForm
  from MyRegistration.models import UserProfile
  
  
  def user_created(sender, user, request, **kwargs):        
      form = UserRegistrationForm(request.POST)
      data = Profile(user=user)
      data.first_name = form.data['first_name']
      data.last_name = form.data['last_name']
      data.save()
  
  from registration.signals import user_registered         
  user_registered.connect(user_created, sender = UserProfile)
  </code></pre>
  
  <p><strong>Urls(root).py</strong></p>
  
  <pre><code>from django.conf.urls.defaults import *
  from django.views.generic.simple import direct_to_template
  from django.contrib import admin
  admin.autodiscover()
  from MyRegistration.forms import UserRegistrationForm
  from registration.views import register
  import registration.backends.default.urls as regUrls
  import MyRegistration.regbackend
  
  
  urlpatterns = patterns('',
  
    url(r'^accounts/register/$', register, {'backend':     
       'registration.backends.default.DefaultBackend','form_class': UserRegistrationForm},       
        name='registration_register'),
        (r'^accounts/', include(regUrls)),
  </code></pre>