title: Remove all CKShare records
body: <h1>Scenario</h1>
  <ul>
  <li><p>UserA shares 5 records with UserB</p>
  </li>
  <li><p>UserC shares 3 records with UserB</p>
  </li>
  <li><p>UserD shares 10 records with UserB</p>
  </li>
  <li><p>UserB has accepted all these shares.</p>
  </li>
  </ul>
  <h1>Goal</h1>
  <p>I would like to provide the ability for UserB to remove all records that have been shared with UserB.</p>
  <h1>Questions</h1>
  <ol>
  <li><p>How would UserB be able to delete all the shares that UserB has accepted without having to remove one by one through <code>UICloudSharingController</code> ?</p>
  </li>
  <li><p>Does it involve querying all <code>CKShare</code> records and deleting them ? If so how would you query (what would be the record type) ?</p>
  </li>
  <li><p>Does it involve deleting all the shared record zones ?</p>
  </li>
  </ol>