optimized loading of settings when in admin interface

git-svn-id: https://plugins.svn.wordpress.org/nextgen-facebook/trunk@808346 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme update

git-svn-id: https://plugins.svn.wordpress.org/nextgen-facebook/trunk@808349 b8457f37-d9ea-0310-8a92-e5e31aec5664