Update the hibernate version from 4.0.2 to 4.1.0 in the samples

Review at http://gwt-code-reviews.appspot.com/1841803

Review by: nchalko@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@11306 8db76d5a-ed1c-0410-87a9-c151d255dfc7