Pass event name and args to #persist_workflow_state

[glasnoster]

I'm using the Vestal Versions gem (https://github.com/laserlemon/vestal_versions) to version user changes in models. I also need to version state changes and attach the user that changed the state to the version change.

I have the user available in the event args. This change basically allows me to do the following:

  def persist_workflow_state(new_state, event, *event_args)
    current_user = event_args[0] && event_args[0][:user]
    self.update_attributes(state: new_state, updated_by: current_user)
  end