uploading 1.6.4...

git-svn-id: https://plugins.svn.wordpress.org/knews/trunk@976624 b8457f37-d9ea-0310-8a92-e5e31aec5664
uploading readme...

git-svn-id: https://plugins.svn.wordpress.org/knews/trunk@976629 b8457f37-d9ea-0310-8a92-e5e31aec5664