Set new Melange version number to 0-5-20090420 in app.yaml.template.
Patch by: Pawel Solyga
from django.core.management.base import NoArgsCommand
class Command(NoArgsCommand):
help = "Validates all installed models."
requires_model_validation = False
def handle_noargs(self, **options):
self.validate(display_num_errors=True)