Updated to version 1.6

git-svn-id: https://plugins.svn.wordpress.org/add-logo-to-admin/trunk@856502 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fixed image issue

git-svn-id: https://plugins.svn.wordpress.org/add-logo-to-admin/trunk@856505 b8457f37-d9ea-0310-8a92-e5e31aec5664