Documentation update and release 0.2 early access

The documentation has been updated with the help of Nnamdi Jibunoh and is now more complete.

I also just commited a first version of the release 0.2 (available in the SVN repository).
-> ILazyPojo (and LazyGwtPojo) inheritance can now be removed from the domain class. Warning : it works only with a stateful POJO store ! For stateless application, you still have to use the LazyGwtPojo abstract class.
-> I did some kind of refactoring, mainly renaming or moving class to a more appropriate package.

The official release may be out by the end of may.

Bruno