Updated the 'tested up to' parameter after successfully testing the plugin with WordPress 4.0 and added graphics for use in the WordPress plugins directory.

git-svn-id: https://plugins.svn.wordpress.org/gravity-forms-light-blue-api-add-on/trunk@978747 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updating assets

git-svn-id: https://plugins.svn.wordpress.org/gravity-forms-light-blue-api-add-on/trunk@978955 b8457f37-d9ea-0310-8a92-e5e31aec5664