lowercase emails

modified:   models/user.py

make_post_sell/models/user.py

@@ -306,6 +306,7 @@ def get_user_by_email(dbsession, email):
 
 def get_or_create_user_by_email(dbsession, email):
     """Try to get User object by email or return new User"""
+    lower_email = email.lower()
     user = get_user_by_email(dbsession, email)
     if user is None:
         # create new User for unverified user.