Merge pull request #370 from jrfnl/master

Fix _Invalid argument supplied for foreach()_ notice for WPML
no message
Merge branch 'master' of https://github.com/Yoast/wordpress-seo
* Fixed bug where posts set to _always_ index would not end up in XML sitemap.
Previous commit: XML Sitemap now loads before theme files are loaded to prevent issues with theme.
Fixed changelog.