Userguide: Added some sections on Granularity, Data-locality and state
Userguide: Added some sections on Granularity, Data-locality and state

mitsuhiko/celery,WoLpH/celery,cbrepo/celery,ask/celery,frac/celery,WoLpH/celery,cbrepo/celery,frac/celery,mitsuhiko/celery,ask/celery