title: delayed_job processes being killed silently
body: <p>I have been using delayed_job successfully for a while. I upgraded my Rails installation and now when I run:</p>
  
  <pre><code>./script/delayed_job -n 4 start
  </code></pre>
  
  <p>to run 4 processes, all 4 processes are created. But they are silently killed immediately, leaving their pid files in RAILS_ROOT/tmp/pids.</p>
  
  <p>This is for delayed_job version 1.8.4 and Rails 2.3.8.</p>