Celery Upgraded; backwards compatibility issues

[vanwars]

Looks like Celery got upgraded on 11/4, and djcelery is no longer necessary. References:

• http://docs.celeryproject.org/en/latest/changelog.html
• http://docs.celeryproject.org/en/latest/django/first-steps-with-django.html

Need to look into celery backend to see if its still working or what the plan should be.