Django 1.8: Fix tests for prior versions of Django

suit/admin.py

@@ -2,12 +2,15 @@
 from django.conf import settings
 from django.contrib.admin import ModelAdmin
 from django.contrib.admin.views.main import ChangeList
-from django.contrib.contenttypes.admin import GenericTabularInline, \
-    GenericStackedInline
 from django.forms import ModelForm
 from django.contrib import admin
 from django.db import models
 from suit.widgets import NumberInput, SuitSplitDateTimeWidget
+try:
+    # Django 1.8 +
+    from django.contrib.contenttypes import admin as ct_admin
+except ImportError:
+    from django.contrib.contenttypes import generic as ct_admin
 
 
 class SortableModelAdminBase(object):
@@ -66,7 +69,7 @@ class SortableTabularInline(SortableTabularInlineBase, admin.TabularInline):
 
 
 class SortableGenericTabularInline(SortableTabularInlineBase,
-                                   GenericTabularInline):
+                                   ct_admin.GenericTabularInline):
     pass
 
 
@@ -129,7 +132,7 @@ class SortableStackedInline(SortableStackedInlineBase, admin.StackedInline):
 
 
 class SortableGenericStackedInline(SortableStackedInlineBase,
-                                   GenericStackedInline):
+                                   ct_admin.GenericStackedInline):
     pass