Adding Celery from Neckbeard Republic.

There are another 30 must watch screencasts too. I would take a glance at it. It was all paid content then made free.
forgot closing bold **
Merge pull request #5 from jonathan-s/master

Add video on caching patterns
Adding 'Better Models Through Custom Managers and QuerySets' to must watch videos
Merge pull request #7 from victornovais/master

Adding 'Better Models Through Custom Managers and QuerySets'
Merge pull request #6 from myusuf3/patch-1

Adding Celery from Neckbeard Republic.
Adding another celery introduction which is slightly more theoretical