title: unexpectedly found nil while unwrapping an Optional value while setting custom FooterCell from xib into tableViewController
body: <blockquote>
    <p>footercell is in  xib</p>
  </blockquote>
  
  <pre><code>override func tableView(tableView: UITableView, viewForFooterInSection section: Int) -&gt; UIView? {
  
     let  footerCell = tableView.dequeueReusableCellWithIdentifier("FooterCell") as! FooterViewCell
      //headerCell.backgroundColor = UIColor.lightGrayColor()
      switch(section)
      {
          case 0:
              footerCell.footerLabel.text = "Asian Ocean"
          case 1:
              footerCell.footerLabel.text = "Europian Ocean"
          case 2:
              footerCell.footerLabel.text = "American Ocean"
          default:
              footerCell.footerLabel.text = "Other"
      }
  
      return footerCell
      /*return NSBundle.mainBundle().loadNibNamed("FooterViewCell", owner: nil, options: nil)[0] as? UIView*/
  }
  
  override func tableView(tableView: UITableView, heightForFooterInSection section: Int) -&gt; CGFloat {
      return 35.0
  }
  </code></pre>