Added group permissions.

git-svn-id: https://plugins.svn.wordpress.org/jsl3-facebook-wall-feed/trunk@822763 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fixed expiration date timing bug.

git-svn-id: https://plugins.svn.wordpress.org/jsl3-facebook-wall-feed/trunk@822878 b8457f37-d9ea-0310-8a92-e5e31aec5664