Add admin app again, because easyaudit needs it.

biscuit/core/settings.py

@@ -41,6 +41,7 @@ ALLOWED_HOSTS = _settings.get('http.allowed_hosts', [])
 
 # Application definition
 INSTALLED_APPS = [
+    'django.contrib.admin',
     'django.contrib.auth',
     'django.contrib.contenttypes',
     'django.contrib.sessions',