title: Generate a django queryset based on dict keys
body: <p>I have a dict like:</p>
  
  <pre><code>{
      'key1' : val1,
      'key2' : val2
  }
  </code></pre>
  
  <p>And I need a queryset like</p>
  
  <pre><code>Q(key1__icontains = val1) | Q(key2__icontains = val2)
  </code></pre>
  
  <p>Thanks</p>