get frame via manage.py so it also works for private items

pandora/item/management/commands/get_frame.py

@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+# vi:si:et:sw=4:sts=4:ts=4
+from django.core.management.base import BaseCommand
+
+import app.monkey_patch
+from ... import models
+
+class Command(BaseCommand):
+    help = 'extract frame and print path'
+    args = '<id> <height> <position>'
+
+    def handle(self, id, height, position, **options):
+        position = float(position)
+        i = models.Item.objects.get(itemId=id)
+        path = i.frame(position, height)
+        print path