v5.7 - compatibility with WordPress 4.0. Now on Github. Please contribute

git-svn-id: https://plugins.svn.wordpress.org/facebook-members/trunk@983377 b8457f37-d9ea-0310-8a92-e5e31aec5664
minor typo fixed

git-svn-id: https://plugins.svn.wordpress.org/facebook-members/trunk@983380 b8457f37-d9ea-0310-8a92-e5e31aec5664