[gatein-dev] GateIn build

[Julien Viet]

now uses Java 6 and it is enforced via maven.

it produces Java 5 code and has checks for Java 5 API.

One of the reasons is that we want to use compile time features that  
are only available in Java 6 (that makes Chromattic proxy generation  
easy based on the APT plugin and avoid to use CGLIB for proxies).

Another reason is that the project has been defined to use Java 6 but  
we want to keep the possiblity to run on a Java 5 VM.

cheers

Julien