tagging release 2.24

git-svn-id: https://plugins.svn.wordpress.org/piwigopress/trunk@1029163 b8457f37-d9ea-0310-8a92-e5e31aec5664
checking in release 2.24


git-svn-id: https://plugins.svn.wordpress.org/piwigopress/trunk@1029167 b8457f37-d9ea-0310-8a92-e5e31aec5664
fix readme authors


git-svn-id: https://plugins.svn.wordpress.org/piwigopress/trunk@1029170 b8457f37-d9ea-0310-8a92-e5e31aec5664