Fixed the PDF download and include issues

git-svn-id: https://plugins.svn.wordpress.org/inpost/trunk@921722 b8457f37-d9ea-0310-8a92-e5e31aec5664
new pdf directory

git-svn-id: https://plugins.svn.wordpress.org/inpost/trunk@921726 b8457f37-d9ea-0310-8a92-e5e31aec5664