Remove useless timezone import

trombi/models.py

@@ -26,7 +26,6 @@ from django.db import models
 from django.utils.translation import ugettext_lazy as _
 from django.core.urlresolvers import reverse
 from django.conf import settings
-from django.utils import timezone
 from django.core.exceptions import ValidationError
 
 from datetime import timedelta, date