Uploading v3.1.6.

git-svn-id: https://plugins.svn.wordpress.org/admin-page-framework/trunk@983918 b8457f37-d9ea-0310-8a92-e5e31aec5664
Marked 3.1.6 as stable.

git-svn-id: https://plugins.svn.wordpress.org/admin-page-framework/trunk@983920 b8457f37-d9ea-0310-8a92-e5e31aec5664