Allow Worker to use a varArgs constructor in order to enable Model Adapters

Hi Greg, 

We need a more generic worker in order to handle different messages composed by a long list of serialized data. As long jesque support a varargs constructor on the worker class, I can delegate the Object[] to my model adapter and it'll handle the necessary steps to recreate my Domain. 

I've created a fallback behavior that doesn't obstruct previous decelerated constructors. 

fmeyer.