Direct gateway script for T-Mobile CZ

Idea based on Kamil Paral's esmska project. Credit to him.
PHP/CURL implementation by jbubik - heavily based on existing direct
gateway scripts way2sms_model.php and gammu_model.php
Security consideration: your system/cache folder MUST be protected
Without proper .htaccess file, your stored cookies are publicly
accessible via HTTP. Anyone could send via your account!