add info to pro version

git-svn-id: https://plugins.svn.wordpress.org/parallax-gravity-landing-page-builder/trunk@914716 b8457f37-d9ea-0310-8a92-e5e31aec5664
fix 1.4 bug

git-svn-id: https://plugins.svn.wordpress.org/parallax-gravity-landing-page-builder/trunk@914720 b8457f37-d9ea-0310-8a92-e5e31aec5664