Fix dependencies

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

tombola/settings/base.py

@@ -32,14 +32,6 @@ ALLOWED_HOSTS = []
 # Application definition
 
 INSTALLED_APPS = [
-    # Theme overrides Django Admin templates
-    # 'theme',
-
-    # External apps
-    'polymorphic',
-    'reversion',
-    'crispy_forms',
-    'django_tables2',
     # Django contrib
     'django.contrib.admin',
     'django.contrib.admindocs',
@@ -55,6 +47,10 @@ INSTALLED_APPS = [
     # Autocomplete
     'dal',
     'dal_select2',
+    # External apps
+    'crispy_forms',
+    'django_tables2',
+    'django_extensions',
 
     # Tombola apps
     'tbde',