title: vertx run -cp option doesn't work
body: <p>I have a question when I use <code>vertx run</code>.</p>
  
  <p>My command is <code>vertx run groovy:myModule -conf conf.json</code>. But the dependencies are all in <code>lib</code>. I find the <a href="http://vertx.io/manual.html#running-verticles-directly" rel="nofollow">doc</a> about add the classpath to vertx, just pass <code>-cp</code> to <code>vertx run</code>.</p>
  
  <p>So I use <code>vertx run groovy:myModule -conf conf.json -cp "lib/*"</code>, but it doesn't works, also  throw <code>unable to resolve class</code> exception.</p>
  
  <p>Then I read the vertx script, I find vertx will pass the <code>CLASSPATH</code> environment variable. So I try this way:</p>
  
  <p><code>CLASSPATH="lib/*" vertx run groovy:myModule -conf conf.json
  </code></p>
  
  <p>It works!</p>
  
  <p>Why <code>-cp</code> is not work?</p>