It's a simple Curl interface which interacts with Mixpanel API.
Install PHP 5.0.1 or higher, if not already installed.
Install PHP's Curl extension, if not already installed. Odds are, if you're running PHP on Mac OS or Windows, the extension's already installed.
        CentOS/RedHat: yum install php-curl
        Debian/Ubuntu: apt-get install php5-curl
Copy and paste applications folder atop your own codeigniter.