tagging version 2.5.1 security update

git-svn-id: https://plugins.svn.wordpress.org/written/trunk@948947 b8457f37-d9ea-0310-8a92-e5e31aec5664
retagging 2.5.1

git-svn-id: https://plugins.svn.wordpress.org/written/trunk@948948 b8457f37-d9ea-0310-8a92-e5e31aec5664