Release 1.99.4

git-svn-id: https://plugins.svn.wordpress.org/rpb-chessboard/trunk@797695 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fix: missing files in release 1.99.4

git-svn-id: https://plugins.svn.wordpress.org/rpb-chessboard/trunk@797696 b8457f37-d9ea-0310-8a92-e5e31aec5664