added custom method so that you don't need to use inheritance if you don't want to.
Merge branch 'CustomWorkflowDefinition' of git://github.com/dnadesign/advancedworkflow

* 'CustomWorkflowDefinition' of git://github.com/dnadesign/advancedworkflow:
  added custom method so that you don't need to use inheritance if you don't want to.