version 1.3 release

git-svn-id: https://plugins.svn.wordpress.org/the-holiday-calendar/trunk@1035689 b8457f37-d9ea-0310-8a92-e5e31aec5664
installation manual update

git-svn-id: https://plugins.svn.wordpress.org/the-holiday-calendar/trunk@1035691 b8457f37-d9ea-0310-8a92-e5e31aec5664