Fixes issue with configuration options not being pickled.

I noticed that a lot of configuration settings to my celery app were being disregarded.  It seems that when the Celery object is pickled, a lot of the config options are dropped.  I'm not sure if this is the most elegant way to fix it, but it appears to work.

I am setting up my options in a celeryconfig.py file and then initializing the Celery instance and setting the config via config_from_object.