delete some deprecated code

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522183 13f79535-47bb-0310-9956-ffa450edef68
remove some gwt-incubator stuff

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522184 13f79535-47bb-0310-9956-ffa450edef68