option to show the output only to users who are not logged in; option to show full marketing text or only partial in the output; minor code optimizations; use 'affurl', 'url', 'link' or 'href' as the URL parameter name

git-svn-id: https://plugins.svn.wordpress.org/wp-scribe-box/trunk@918312 b8457f37-d9ea-0310-8a92-e5e31aec5664