remove warnings

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522224 13f79535-47bb-0310-9956-ffa450edef68
new spirit should come with 2013, this is the first commit

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522225 13f79535-47bb-0310-9956-ffa450edef68
fix the bug that there will throw a NullPointerException after the first time into the message view page and then click the back link given not click the folders names

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522226 13f79535-47bb-0310-9956-ffa450edef68
update to the latest 2.5.0 version of gwt

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522227 13f79535-47bb-0310-9956-ffa450edef68