test to 3.9, readme updates

git-svn-id: https://plugins.svn.wordpress.org/admin-slug-column/trunk@894550 b8457f37-d9ea-0310-8a92-e5e31aec5664
cap plugin name in readme 

git-svn-id: https://plugins.svn.wordpress.org/admin-slug-column/trunk@894554 b8457f37-d9ea-0310-8a92-e5e31aec5664