title: Fullcalendar+moment.js give moment.defineLocale deprecation warning
body: <p>I'm using latest fullcalendar (3.1.0) and moment.js, and got a warning in console:</p>
  
  <p>"<em>Deprecation warning: use moment.updateLocale(localeName, config) to change an existing locale. moment.defineLocale(localeName, config) should only be used for creating a new locale See <a href="http://momentjs.com/guides/#/warnings/define-locale/" rel="nofollow noreferrer">http://momentjs.com/guides/#/warnings/define-locale/</a> for more info.</em>".</p>
  
  <p>Just after initialization:</p>
  
  <pre><code>moment.locale('ru');
  moment.tz.setDefault('Europe/Moscow');
  ...
  $('#schedule').fullCalendar({
      lang: 'ru',
      ...
  });
  </code></pre>
  
  <p>But I can't find call to <code>defineLocale</code> anywhere.
  Other pages that also using moment.js is ok.
  Where is the problem?
  Thank you.</p>