[eluser]pickupman[/eluser]
Welcome to forums. You will want to put any library that is not part of CI download into /application/libraries. The /system/libraries folder is for core files only. You can still (auto)load the libraries the same way either way.
Code:
$this->load->library('your_library');
//or in /application/config/autoload.php
$autoload['libraries'] = array('your_library');