Release of version 2.3.

git-svn-id: https://plugins.svn.wordpress.org/diycware-image-editor/trunk@902060 b8457f37-d9ea-0310-8a92-e5e31aec5664
Remove old file diyc-header.php.

git-svn-id: https://plugins.svn.wordpress.org/diycware-image-editor/trunk@902061 b8457f37-d9ea-0310-8a92-e5e31aec5664