GWT 1.5 M2 minor fix

The support for GWT 1.5 M2 suffers of a minor bug for project that do not use JPA annotations at all.
I published a new version of the release (1.0.4b_GWT15_M2) which fix it.
Henceforth, projects that *DO* use annotations need to add the following line in the gwt.xml file, just after the classic 'Hibernate4GWT' inherit line :
<inherits name='net.sf.hibernate4gwt.emul.ejb3.Emul'/>

Bruno