title: "Scene is unreachable due to lack of entry points and does not have..." - solution this warning
body: <p>The full warning is</p>
  
  <blockquote>
    <p>Scene is unreachable due to lack of entry points and does not have an
    identifier for runtime access via-
    instantiateViewControllerWithIdentifier:.</p>
  </blockquote>
  
  <p>I have used Xcode-7.01, why this warning is coming and what is the solution ?</p>