title: Swift NSDateFormatter not using correct locale and format
body: <p>This is my code:</p>
  
  <pre><code>let currentDate = NSDate()
  let usDateFormat = NSDateFormatter()
  usDateFormat.dateFormat = NSDateFormatter.dateFormatFromTemplate("d MMMM y", options: 0, locale: NSLocale(localeIdentifier: "en-US"))
  cmt.date = usDateFormat.stringFromDate(currentDate)
  </code></pre>
  
  <p>I was expecting to get "15 October 2015", but I got "oktober 15, 2015". The month is in swedish locale.</p>
  
  <p>What have I done wrong? Both locale and format are wrong.</p>