Release 1.4.25, see readme.txt for changelog.

git-svn-id: https://plugins.svn.wordpress.org/wordpress-seo/trunk@865506 b8457f37-d9ea-0310-8a92-e5e31aec5664
Release 1.4.25, see readme.txt for changelog. #2

git-svn-id: https://plugins.svn.wordpress.org/wordpress-seo/trunk@865523 b8457f37-d9ea-0310-8a92-e5e31aec5664