Fix imports

apps/maintenance/__init__.py

@@ -2,6 +2,6 @@ from __future__ import absolute_import
 
 from project_tools.api import register_tool
 
-from .links import maintenance_menu, statistics
+from .links import maintenance_menu
 
 register_tool(maintenance_menu)

apps/maintenance/views.py

@@ -3,6 +3,9 @@ from __future__ import absolute_import
 from django.shortcuts import render_to_response
 from django.template import RequestContext
 from django.utils.translation import ugettext_lazy as _
+from django.core.exceptions import PermissionDenied
+
+from permissions.models import Permission
 
 from .api import tools