add pro message to description

git-svn-id: https://plugins.svn.wordpress.org/bbpress-notify-nospam/trunk@1043696 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixed settings include list

git-svn-id: https://plugins.svn.wordpress.org/bbpress-notify-nospam/trunk@1043699 b8457f37-d9ea-0310-8a92-e5e31aec5664
apply readme fixes to branch

git-svn-id: https://plugins.svn.wordpress.org/bbpress-notify-nospam/branches/1.6@1043702 b8457f37-d9ea-0310-8a92-e5e31aec5664