V2.24 - Add checking installed wordpress version. Activation of radio button or checkbox by clicking on its label. We updated all functionality for wordpress 3.7.1. Problem with undefined variable post_ID for multisite fixed.

git-svn-id: https://plugins.svn.wordpress.org/facebook-button-plugin/trunk@796662 b8457f37-d9ea-0310-8a92-e5e31aec5664