title: Remove multiple items from Immutable List in one shot
body: <p>Given this:</p>
  
  <pre><code>state = Immutable.fromJS({
    selectedTrackIds: ['foo', 'bar', 'baz'],
  });
  </code></pre>
  
  <p>Is there a way to get a new state where 'foo' and 'baz' are removed from <code>selectedTrackIds</code>, using a single statement (using only Immutable and plain JS)? Or will I just have to use lodash?</p>
  
  <pre><code>return state.set('selectedTrackIds', Immutable.fromJS(_.difference(
    state.get('selectedTrackIds').toJSON(), ['foo', 'baz']
  )));
  </code></pre>