title: dateFromString returns nil every time format possibly wrong?
body: <p>I am trying to use date from string method like below:</p>
  
  <pre><code>var dateNow = self.tags![indexPath.row].date!
  let timeZone = NSTimeZone(name: "UTC")
  let df = NSDateFormatter()
  df.locale = NSLocale.currentLocale()
  df.timeZone = timeZone
  df.dateFormat = "yyyy-MM-ddThh:mm"
  let date: NSDate = df.dateFromString(dateNow)! //this is nil and throws an unwrapping error
  </code></pre>
  
  <p>The date is formatted like this</p>
  
  <pre><code>dateNow String  "2015-04-19T17:00:42.205Z"  
  </code></pre>
  
  <p>Im guessing maybe that is formatted wrong but I have no idea how to write the df.dateFormat</p>