update to release 2.25


git-svn-id: https://plugins.svn.wordpress.org/piwigopress/trunk@1050776 b8457f37-d9ea-0310-8a92-e5e31aec5664
more version number updates


git-svn-id: https://plugins.svn.wordpress.org/piwigopress/trunk@1050778 b8457f37-d9ea-0310-8a92-e5e31aec5664