Django-multilingual-news

- some useful additions to the default entry template

- added PublishEntryView to publish or unpublish entries
- added NewsEntryDeleteView to delete entries
- added publish/unpublish and delete buttons to entry template
- added bootstrap modal for delete view
- added optional bootstrap ressources

- fixed migration dependencies

- displaying all entries, even if unpublished, when a user is logged in as
superuser

- Making entry preview require admin or staff login.

Backwards incompatible:
- added authors based on django-people
* removes old authors FK to auth.User and adds FK to people.Person instead.
If you want to keep all the authors, you may need to create the respective
Persons yourself and make a datamigration before migration 0016.
Check migrations 0014-0016 for more details.

Features:
- added attachments based on django-document-library
- added tagging with django-multilingual-tags
- added a tag based list view
- added categories
- added RSS Feeds
- added NewsSitemap
- added SEO fields and tags
- split news entry detail view and made another dedicated preview view, adding
"preview" to the template context

Fixes:
- improved managers by using language aware hvad managers
- fixed NewsEntry.is_public
- fixed some get_absolute_url methods