WP 3.9+ / TinyMCE 4* friendly

git-svn-id: https://plugins.svn.wordpress.org/cf7-mce/trunk@960454 b8457f37-d9ea-0310-8a92-e5e31aec5664
update upgrade infos

git-svn-id: https://plugins.svn.wordpress.org/cf7-mce/trunk@960456 b8457f37-d9ea-0310-8a92-e5e31aec5664