Not compatible with php5.5+

Hi there

This project uses a custom class called `Generator`. Under php5.5+ this class name is reserved and can't be redeclared. Fortunately, there's only two lines in one file (`GameEngine/Generator.php` lines 12 and 159) to edit to fix this by renaming the class and using the new name in its instantiation.

As for php 7, all `mysql_` prefixed functions must be removed. That's a much harder task to perform but if pull requests are welcome, I might get to it since I will be running this script on my server under php 7 if possible (I'm currently testing it under PHP 5.6 after renaming the `Generator` class)