Update the navigation app to use app registry and icon system

apps/navigation/icons.py

@@ -1,6 +1,7 @@
 from __future__ import absolute_import
 
-from icons.literals import ERROR
+from icons.literals import ERROR, ROUTING_TURNAROUND_RIGHT
 from icons import Icon
 
 icon_error = Icon(ERROR)
+icon_navigation = Icon(ROUTING_TURNAROUND_RIGHT)

apps/navigation/registry.py

@@ -0,0 +1,13 @@
+from __future__ import absolute_import
+
+from django.utils.translation import ugettext_lazy as _
+
+from smart_settings import LocalScope
+
+from .icons import icon_navigation
+
+name = 'navigation'
+label = _(u'Navigation')
+description = _(u'Handles UI navigation, menus and links.')
+icon = icon_navigation
+dependencies = ['app_registry', 'permissions']