version 3.8 with SSL pages support

git-svn-id: https://plugins.svn.wordpress.org/pdf24-posts-to-pdf/trunk@1042544 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme file update

git-svn-id: https://plugins.svn.wordpress.org/pdf24-posts-to-pdf/trunk@1042548 b8457f37-d9ea-0310-8a92-e5e31aec5664