Added opt-in for commenters

git-svn-id: https://plugins.svn.wordpress.org/comment-approved/trunk@1025821 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added opt-in for commenters

git-svn-id: https://plugins.svn.wordpress.org/comment-approved/trunk@1025824 b8457f37-d9ea-0310-8a92-e5e31aec5664