Expenses sample pom.xml. Fixes Issues:
5438: Expenses sample pom.xml points to outdated Roo version
5497: Expenses sample cannot find jdo2-api-2.3-ec.jar

Review at http://gwt-code-reviews.appspot.com/1124801


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9251 8db76d5a-ed1c-0410-87a9-c151d255dfc7