<li>Add in choices information for ChoiceFields in response to <code>OPTIONS</code> requests.</li>
<li>Added <code>pre_delete()</code> and <code>post_delete()</code> method hooks.</li>
<li>Added status code category helper functions.</li>
<li>Bugfix: Partial updates which erronously set a related field to <code>None</code> now correctly fail validation instead of raising an exception.</li>
<li>Bugfix: Responses without any content no longer include an HTTP <code>'Content-Type'</code> header.</li>
<li>Bugfix: Correctly handle validation errors in PUT-as-create case, responding with 400.</li>