title: UICollectionView allow multiple selection for specific section
body: <p>Is there a way to allow multiple selection only for a specific section? The code below affects all sections.</p>
  
  <pre><code>[self.collectionView setAllowsMultipleSelection:YES];
  </code></pre>
  
  <p>Should i keep track of the states and do something in <code>didSelect</code>?</p>