Added source field in Post admin
Merge branch 'master' of github.com:opps/opps

* 'master' of github.com:opps/opps:
  fix typo
  Fix bug generate long slug in over 2 level channel, ref #227
  Add missing gexttextlazy on PostRelatedInline / update article locales
  Change channel locales
  Add missing verbose_name on channel parent field
  Change archive locale files
  Add archive verbose name
  Use mptt admin
  fix pep8, channel admin opps/channels/admin.py:57:80: E501 line too long (91 > 79 characters) opps/channels/admin.py:70:80: E501 line too long (85 > 79 characters)
  fix: support to recursive channeling
  fix: channel.json supporting subchannel, and generic channel.json on containers root