title: Possible to change the package name when generating client code
body: <p>I am generating the client scala code for an API using the Swagger Edtior. I pasted the json then did a Generate Client/Scala. It gives me a default root package of </p>
  
  <blockquote>
    <p>io.swagger.client</p>
  </blockquote>
  
  <p>I can't see any obvious way of specifying something different. Can this be done?</p>