Update jQuery UI CSS

git-svn-id: https://plugins.svn.wordpress.org/visual-form-builder/trunk@777246 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update CSS and JS to use cache busting version numbers

git-svn-id: https://plugins.svn.wordpress.org/visual-form-builder/trunk@777247 b8457f37-d9ea-0310-8a92-e5e31aec5664