title: Hook Before All Delayed Jobs
body: <p>Is it possible to have a method run before ALL delayed_job tasks?  </p>
  
  <p>Basically, we're trying to make sure that every server that is running delayed_job has the latest instance of our code, so we want to run a method that checks this before every job is run. </p>
  
  <p>(We already have the "check" method and use it elsewhere. The question is only about how to call it from delayed_job.)</p>