fix: get_child recursivelly
Merge branch 'master' into templatetag

* master: (33 commits)
  Add redis drive on requirements
  Add services redis server on travis
  write test on notifications
  Add opps contrib notifications tests
  set dynamic db int, on db drive
  Fix browser Support on admin, used grappelli
  Update Features on docs
  Add Features topic on overview file
  Set new developer version 0.2.1
  Create initial migration for notifications on opps contrib
  create url entry long puling to notification
  create view to long pulling server return json, add var old_id get > id in query set
  create url entery to Async server notifications application
  Create APIServer view on notification used to json render
  generate messagem type (json)
  Create admin notification
  add save on opps nosql (redis) in opps contrib notification
  fix typo type to default on Notification class
  remove class view name
  Update save Notification, save in nosql database
  ...
Fix pep8 on template tag, get container by channel
Fix test get_container_by_channel, write recursive test