Traits for java (interfaces with implemented methods)

A DESCRIPTION OF THE REQUEST :
One interesting feature can be Traits (interfaces with implemented methods)

   Please see: http://code.google.com/p/groovypptest/wiki/Traits

PD: this change is minimun from a java coder view (some methods on
interfaces can have a default implementation)




JUSTIFICATION :
Split multiples functionalities on each Traits and remove macro-classes with macro-functionalities