version 4.0

git-svn-id: https://plugins.svn.wordpress.org/facebook-master/trunk@790920 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixing links, nothing major

git-svn-id: https://plugins.svn.wordpress.org/facebook-master/trunk@790936 b8457f37-d9ea-0310-8a92-e5e31aec5664
wp 3.7 ready

git-svn-id: https://plugins.svn.wordpress.org/facebook-master/trunk@793792 b8457f37-d9ea-0310-8a92-e5e31aec5664