Update the sprite folder

git-svn-id: https://plugins.svn.wordpress.org/rpb-chessboard/trunk@858919 b8457f37-d9ea-0310-8a92-e5e31aec5664
Release 2.2

git-svn-id: https://plugins.svn.wordpress.org/rpb-chessboard/trunk@858920 b8457f37-d9ea-0310-8a92-e5e31aec5664
Typo

git-svn-id: https://plugins.svn.wordpress.org/rpb-chessboard/trunk@858924 b8457f37-d9ea-0310-8a92-e5e31aec5664
Release 2.2.1

git-svn-id: https://plugins.svn.wordpress.org/rpb-chessboard/trunk@858942 b8457f37-d9ea-0310-8a92-e5e31aec5664