Uploading v2.1.5.

git-svn-id: https://plugins.svn.wordpress.org/admin-page-framework/trunk@816585 b8457f37-d9ea-0310-8a92-e5e31aec5664
Marked 2.1.5 as stable.

git-svn-id: https://plugins.svn.wordpress.org/admin-page-framework/trunk@816587 b8457f37-d9ea-0310-8a92-e5e31aec5664