Add stable tags

git-svn-id: https://plugins.svn.wordpress.org/mg-post-contributors/trunk@872526 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update stable tag

git-svn-id: https://plugins.svn.wordpress.org/mg-post-contributors/trunk@872527 b8457f37-d9ea-0310-8a92-e5e31aec5664