title: Workflow engine in nodejs
body: <p>I'm writing a QA bot,</p>
  
  <p>which use expressjs as back-end service, and client use REST to ask question &amp; got reply.</p>
  
  <p>so I'm searching for a workflow engine or a statemachine lib.</p>
  
  <p>had read <a href="https://stackoverflow.com/questions/10414849/workflow-engine-in-javascript">Workflow engine in Javascript</a>
  but it seems to use at front-end.</p>
  
  <p>and found a lib noflo , but hard to use for a newbe not familiar with english.</p>