Threading support for django httpd service

After django release number 1.5, threading in runserver was set on by default.
in some cases, multiple requests in same time causes a slow reply.
	
credentials:
https://docs.djangoproject.com/en/1.4/ref/django-admin/#django-admin-option---nothreading
https://github.com/django/django/blob/master/django/core/servers/basehttp.py#L164