Finish migrating final apps to Django 1.7

mayan/apps/navigation/apps.py

@@ -0,0 +1,9 @@
+from __future__ import unicode_literals
+
+from django import apps
+from django.utils.translation import ugettext_lazy as _
+
+
+class NavigationApp(apps.AppConfig):
+    name = 'navigation'
+    verbose_name = _('Navigation')