re #811 - Added the 'og:type' property, it is required
re #811 - Specified author with the meta property attribute instead of meta name attribute
re #811 - Replaced author metadata with article:publisher
re #811 - Added og:site_name property
Merge branch 'master' into feature/787-publish

Conflicts:
	application/site/component/news/view/article/templates/default.html.php
Merge branch 'feature/787-publish' into staging