add splitter

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522356 13f79535-47bb-0310-9956-ffa450edef68
change setting playground's background to be different

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522357 13f79535-47bb-0310-9956-ffa450edef68