Add NewsArticleType
added more test able news_article type validity
Add validation on type and imported state
added news_article_type_fields
show news type documents show
News Article type with speed tagging and filter changes
Make the news types behave like the speech types in announcement_filter_option

Should we need to add more news types to the same filter this will make
it more future proof
Merge pull request #157 from alphagov/new-article-additional-types

News articles to have additional types