Code that can be removed

[jbirddog]

if there is any desire, CompactBpmnWorkflowSerializer and BpmnSpecSerializer ended up being superceeded by just not (de)serializing the workflow in ed, so they can be removed from spiffworkflow

[essweine]

Yes, let's remove it. In general, we should not have application specific code in the library, which should remain as generic as possible.