upgraded module preview

git-svn-id: https://plugins.svn.wordpress.org/page-layout-builder/trunk@862459 b8457f37-d9ea-0310-8a92-e5e31aec5664
* Added cache control option

git-svn-id: https://plugins.svn.wordpress.org/page-layout-builder/trunk@864925 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added Tab Mobule

git-svn-id: https://plugins.svn.wordpress.org/page-layout-builder/trunk@867381 b8457f37-d9ea-0310-8a92-e5e31aec5664