some code and options handling improvements and added a screenshot

git-svn-id: https://plugins.svn.wordpress.org/article-directory-redux/trunk@892799 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated readme

git-svn-id: https://plugins.svn.wordpress.org/article-directory-redux/trunk@892801 b8457f37-d9ea-0310-8a92-e5e31aec5664