title: Prevent CasperJS from exiting when all steps are complete
body: <p>I have a dynamic CasperJS suite, that works around WebServer built-in in PhantomJS. New steps are added dynamically to the suite.</p>
  
  <p>However, right now, Casper exists as soon as all pending steps are completed.</p>
  
  <p>How do I prevent it from automatically closing and wait for more steps to be added dynamically?</p>