Added empty migrations with dependencies of external apps.

This way we can provide the correct order of migrations without messing with
the original migrations.
Moved blog templates from cmsplugin_blog to multingual_news.
Removed old middlewares for viewing content in different languages.
Updated context processor to add SESSION_LANGUAGE based on GET args.
Updated installed_apps and cms settings.
Updated Migration: Changing blog base template.
Removed AttachmentInline from old cmsplugin_blog Entry admin.

Now the AttachmentInline is directly linked to a multilingual_news.NewsEntry
inside multilingual_news.
Increased migration number on dependency.
Corrected tagging markup
Added custom news feed, that can cope with the entry language urls.
Updated admin tools dashboard and menu
Removed references to cmsplugin_blog
Simplified session_language context_processor.
Updated the multilingual_project_blog_tags.

* Changed queries and templates, that should now work for multilingual-news
  instead of cmsplugin_blog
* Removed some obsolete tags
* Added get_translation tags to get specific hvad translation of an object
Updated urls.
Updated document_library templates.

* removed cmsplugin_blog_tags and simple_translation_tags
* accessing translated fields hvad style
* changed placeholder syntax
Changed good_practice_examples templates

* removed cmsplugin_blog_tags and simple_translation_tags
* accessing translated fields hvad style
* changed placeholder syntax
Updated multilingual_events templates.

* removed cmsplugin_blog_tags and simple_translation_tags
* accessing translated fields hvad style
* changed placeholder syntax
Updated multilingual_news templates

* adopted old templates from cmsplugin_blog and updated them to match
  multilingual_news
* removed cmsplugin_blog_tags and simple_translation_tags
* accessing translated fields hvad style
* changed placeholder syntax
* updated rss urls
* added conditional rendering of excerpt in news detail preview, so one can
  update the plugins via front end editing
Updated other app's templates.

-> django-multilingual-initiatives, django-multilingual-orgs, django-people

* removed cmsplugin_blog_tags and simple_translation_tags
* accessing translated fields hvad style
* changed placeholder syntax