Fix _Invalid argument supplied for foreach()_ notice for WPML as reported by [pbearne](https://github.com/pbearne) in issue #369
Merge branch 'master' of git://github.com/jdevalk/wordpress-seo
Upped the dev version version number to 1.4.20-beta
Added note about WooCommerce
Merge branch 'master' of git://github.com/jdevalk/wordpress-seo
Merge branch 'master' of git://github.com/jdevalk/wordpress-seo
Merge pull request #370 from jrfnl/master

Fix _Invalid argument supplied for foreach()_ notice for WPML