title: Problem with PHPExcel
body: <p>I have a simple table:</p>
  
  <pre>
  CREATE TABLE IF NOT EXISTS `users` (
    `id` int(10) NOT NULL AUTO_INCREMENT,
    `email` varchar(225) NOT NULL DEFAULT '',
    `date` datetime DEFAULT NULL,
    `status` int(1) NOT NULL DEFAULT '1',
    PRIMARY KEY (`id`)
  ) ENGINE=MyISAM;
  </pre>
  
  <p>I'm using PHPExcel to export tha table in XLS format.
  I wrote a simple PHP lines:</p>
  
  <pre>
  <code>
  $dbhost = "localhost";
  $dbuser = "root";
  $dbpass = "";
  $dbname = "svn_register";
  
  mysql_connect($dbhost,$dbuser,$dbpass);
  mysql_select_db($dbname);
  
  // require the PHPExcel file
  require 'Classes/PHPExcel.php';
  
  // simple query
  
  $query = "SELECT * FROM users ORDER by id DESC";
  
  if ($result = mysql_query($query) or die(mysql_error())) {
      // Create a new PHPExcel object
     $objPHPExcel = new PHPExcel();
     $objPHPExcel->getActiveSheet()->setTitle('List of Cities');
  
     // Loop through the result set
      $rowNumber = 1;
      while ($row = mysql_fetch_row($result)) {
         $col = '';
         foreach($row as $cell) {
            $objPHPExcel->getActiveSheet()->setCellValue($col.$rowNumber,$cell);
            $col++;
         }
         $rowNumber++;
     }
     // Save as an Excel BIFF (xls) file
     $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
  
     header('Content-Type: application/vnd.ms-excel');
     header('Content-Disposition: attachment;filename="myFile.xls"');
     header('Cache-Control: max-age=0');
  
     $objWriter->save('php://output');
     exit();
  }
  echo 'a problem has occurred... no data retrieved from the database';
  
  </code>
  </pre>
  
  <p>I get an empty page.</p>