Namespaced code, removed config.ini.php

I've namespaced the LiveChat module and made it [PSR-0](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md) compliant so it can work with autoloaders that support the standard. I also removed the config.ini.php file in favor of passing in the login credentials as constructor arguments for the API class.