rename DiffModelMixin to PlModelMixin
diff --git a/planetstack/core/models/user.py b/planetstack/core/models/user.py
index 2f75db7..fda4401 100644
--- a/planetstack/core/models/user.py
+++ b/planetstack/core/models/user.py
@@ -7,7 +7,7 @@
 from django.db import models
 from django.db.models import F, Q
 from django.utils import timezone
-from core.models import PlCoreBase,Site, DashboardView, DiffModelMixIn
+from core.models import PlCoreBase,Site, DashboardView, PlModelMixIn
 from django.contrib.auth.models import AbstractBaseUser, BaseUserManager
 from timezones.fields import TimeZoneField
 from operator import itemgetter, attrgetter
@@ -84,7 +84,7 @@
     def get_query_set(self):
         return self.get_queryset()
 
-class User(AbstractBaseUser, DiffModelMixIn):
+class User(AbstractBaseUser, PlModelMixIn):
     @property
     def remote_password(self):
         return hashlib.md5(self.password).hexdigest()[:12]
@@ -138,7 +138,7 @@
 
     def __init__(self, *args, **kwargs):
         super(User, self).__init__(*args, **kwargs)
-        self._initial = self._dict # for DiffModelMixIn
+        self._initial = self._dict # for PlModelMixIn
 
     def isReadOnlyUser(self):
         return self.is_readonly