title: Get selected option in Select2 event, when multiple options can be selected
body: <p>How can I get hold on the <code>&lt;option&gt;</code> that was just selected when listening to the <code>select2:select</code> event? Note that this is simple when using a single-select, as when only one option is selected, that must be the one that was just selected. I would like to also be able to find the option that was just selected when using a multiple-select (<code>&lt;select multiple&gt;</code>).</p>
  
  <p>In the <code>select2:unselect</code> event, the unselected <code>&lt;option&gt;</code> is available through <code>e.params.data.element</code>, but it is not so in the <code>select2:select</code> event. I do not see a reason why the <code>&lt;option&gt;</code> should not be available, since it is created at this time. For the <code>select2:selecting</code> event, however, the <code>&lt;option&gt;</code> is not yet created, and obviously cannot be available when the event is fired.</p>