Put post date and author at the top of news_post layouts

News are news because of their timeliness, it's crucial for especially
release news posts to have their date displayed in a location that is
immediately obvious for readers: below the title.
Merge pull request #895 from olivierlacan/emphasize-date-on-news-post

Put post date and author at the top of news_post layouts
Small fix
 Translate 2014-11-25-ruby-2-2-0-preview2-released.md (bg)