code: def activate(self, request, activation_key):
            
          if SHA1_RE.search(activation_key):
              try:
                  profile = RegistrationProfile.objects.get(activation_key=activation_key)
              except RegistrationProfile.DoesNotExist:
                  return False
                  
              user = profile.user
              user.is_active = True
              user.save()
              profile.activation_key = RegistrationProfile.ACTIVATED
              profile.save()
              return user
          return False
docs: Override default activation process. This will activate the user
          even if its passed its expiration date.