email_re moved again

[avoine]

The email regex move again so to be sure it work on newer django version you'll need that patch:

diff --git a/blinvite/forms.py b/blinvite/forms.py
index 73e1589..f107a12 100644
--- a/blinvite/forms.py
+++ b/blinvite/forms.py
@@ -1,7 +1,11 @@
 from django import forms
 from django.utils.translation import ugettext as _
 from django.contrib.auth.models import User
-from django.forms.fields import email_re
+
+try:
+    from django.forms.fields import email_re
+except ImportError:
+    from django.core.validators import email_re

 from busylissy.blinvite.models import Invite