Support auto-reconnect

[matthill]

It does not seem like the code handles the cases where:

1. Beanstalkd is not available when the django app is launched
2. The django app is launched and Beanstalkd is available, but later Beanstalkd goes down and then comes back up again

[jonasvp]

Good point. We've since moved away from Beanstalk so I can't write a patch myself. I'll be happy to merge if you take a stab at it!