title: Save Celery tasks to database for monitor in Django admin
body: <p>I successfully setup Celery 3.1 + Django 1.6 + Djcelery, tasks are working, all good. In Django admin interface i see  Djcelery menu with options, but no tasks are visible on Tasks tab, no worker on Workers tab.</p>
  
  <p>How to configure to let them store automatically with statuses?</p>
  
  <p>my settings.py:</p>
  
  <pre><code>    # Celery settings
  
  #BROKER_URL = 'amqp://guest:guest@localhost//'
  BROKER_URL = 'django://'
  
  from kombu.serialization import registry
  registry.enable('pickle')
  
  #: Only add pickle to this list if your broker is secured
  #: from unwanted access (see userguide/security.html)
  CELERY_ACCEPT_CONTENT = ['json', 'pickle']
  CELERY_TASK_RESULT_EXPIRES=3600
  #CELERY_RESULT_BACKEND='amqp'
  CELERY_RESULT_BACKEND='djcelery.backends.database:DatabaseBackend'
  # postgresql
  #CELERY_RESULT_BACKEND = 'db+postgresql://postgres:111222@localhost/graphgrail'
  #CELERY_RESULT_BACKEND='djcelery.backends.cache:CacheBackend',
  CELERY_RESULT_SERIALIZER = 'json' #json pickle msgpack
  CELERY_TASK_SERIALIZER = 'json'
  CELERY_IMPORTS=["vk_wall.tasks"]
  </code></pre>