Uploading v3.1.2.

git-svn-id: https://plugins.svn.wordpress.org/admin-page-framework/trunk@962928 b8457f37-d9ea-0310-8a92-e5e31aec5664
Marked 3.1.2 as stable.

git-svn-id: https://plugins.svn.wordpress.org/admin-page-framework/trunk@962931 b8457f37-d9ea-0310-8a92-e5e31aec5664