Verified WordPress 3.9 compatibility

git-svn-id: https://plugins.svn.wordpress.org/postie/trunk@905802 b8457f37-d9ea-0310-8a92-e5e31aec5664
prep 1.5.20 release

git-svn-id: https://plugins.svn.wordpress.org/postie/trunk@905815 b8457f37-d9ea-0310-8a92-e5e31aec5664