Hibernate4GWT 1.1

This new release of Hibernate4GWT adds some improvements, such as

* Supports UserType
* Supports wrapping objets (ie non persistent instance embedding persistent ones).
* Dynamic proxy code externalisation

It also solves bugs from previous 1.0.4 release, such as merge error after modifying an association on client side, or map merge.

I started a heavy refactoring of the library, so a migration step is needed, which is detailed in the FAQ section.

At last, this release is fully compatible with both GWT 1.4 and 1.5, and use the last BeanLib version, which also fix some issues.