title: Deploy a sub package with distutils and pip
body: <p>I am wanting to create a suite of interrelated packages in Python. I would like them all to be under the same package but installable as separate components.</p>
  
  <p>So, for example, installing the base package would provide the <code>mypackage</code> but there would be nothing in <code>mypackage.subpackage</code> until I install it separately.</p>
  
  <p>Is this possible with distutils and pip?</p>