Removed Google recaptcha and added simple Integer addition captcha for simplicity. Also overhauled the plugin structure so you might need to reconfigure FORM fields.

git-svn-id: https://plugins.svn.wordpress.org/thinkit-wp-contact-form/trunk@787442 b8457f37-d9ea-0310-8a92-e5e31aec5664
Removing Google Recapcta Files and adding plain captcha file.

git-svn-id: https://plugins.svn.wordpress.org/thinkit-wp-contact-form/trunk@787445 b8457f37-d9ea-0310-8a92-e5e31aec5664
Adding Captcha changes.

git-svn-id: https://plugins.svn.wordpress.org/thinkit-wp-contact-form/trunk@787450 b8457f37-d9ea-0310-8a92-e5e31aec5664
Adding placeholder for captcha.

git-svn-id: https://plugins.svn.wordpress.org/thinkit-wp-contact-form/trunk@787460 b8457f37-d9ea-0310-8a92-e5e31aec5664