title: Configure docker-compose override to ignore / hide some containers
body: <p>If I have (simplified), the following <em>docker-compose.yml</em>:</p>
  
  <pre><code>parent:
    image: parent
    links:
      - child
  
  child:
    image: child
  </code></pre>
  
  <p>Can I construct a <em>docker-compose.override.yml</em> file that will <strong>not</strong> create or start the <code>child</code> image?</p>
  
  <hr>
  
  <p>An undesirable (for me) solution, would be to reverse the files, such that the default yml file would create only the <code>parent</code>, and the override would create both.</p>
  
  <p>However, I would like the <em>master</em> configuration file to contain the most common usage scenario.</p>