schedula process_map_updates usind celery on new MapUpdate creation

src/c3nav/mapdata/tasks.py

@@ -0,0 +1,22 @@
+from django.utils.formats import date_format
+from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import ungettext_lazy
+
+from c3nav.celery import app
+
+
+@app.task(rate_limit='1/m')
+def process_map_updates():
+    from c3nav.mapdata.models import MapUpdate
+    updates = MapUpdate.process_updates()
+
+    if updates:
+        print()
+
+    print(ungettext_lazy('%d map update processed.', '%d map updates processed.', len(updates)) % len(updates))
+
+    if updates:
+        print(_('Last processed update: %(date)s (#%(id)d)') % {
+            'date': date_format(updates[-1].datetime, 'DATETIME_FORMAT'),
+            'id': updates[-1].pk,
+        })