[gatein-dev] GateIn build

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