GWT 1.5 M1 support

Here is the hibernate4gwt update to support the first milestone of GWT 1.5 !
With it, it is now possible to seamlessly send annotated EJB entities to the GWT, without need of DTO !
Note that for reasons explained at http://www.dotnetguru2.org/bmarchesson/index.php?p=786&more=1&c=1&tb=1&pb=1, hibernate4gwt is still needed if you want to send your entities to the GWT client side...