Restrict psuedo-wp_mail execution to mail administrator only, for security.  Readme update.

git-svn-id: https://plugins.svn.wordpress.org/spammers-suck/trunk@836517 b8457f37-d9ea-0310-8a92-e5e31aec5664
Include blog url for authentication, VN update.

git-svn-id: https://plugins.svn.wordpress.org/spammers-suck/trunk@836518 b8457f37-d9ea-0310-8a92-e5e31aec5664