tweaks to recaptcha and changes to the readme text

git-svn-id: https://plugins.svn.wordpress.org/users-ultra/trunk@998336 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme text update

git-svn-id: https://plugins.svn.wordpress.org/users-ultra/trunk@998339 b8457f37-d9ea-0310-8a92-e5e31aec5664