merged changes from main branch

git-svn-id: https://plugins.svn.wordpress.org/ag-custom-admin/branches/1.2.8@789960 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added option for disabling admin menu auto folding

git-svn-id: https://plugins.svn.wordpress.org/ag-custom-admin/branches/1.2.8@794255 b8457f37-d9ea-0310-8a92-e5e31aec5664