add django_cas_ng in installed application and upgrade django_cas_ng to correct a model problem
#!/usr/bin/env python
import os
import sys
if __name__ == "__main__":
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "remieplt.settings.dev")
from django.core.management import execute_from_command_line
execute_from_command_line(sys.argv)