Implement an __autoload function.

[kwisatz]

Implement an autoload function that automatically includes class files according to a specific naming convention.

I.e. : class ClassName is inside lib/class_name.class.php

[kwisatz]

CamelCase to nocamel_case would be
preg_replace('/(?<=\w)([A-Z])/','_$1',$camelCase);

but is actually pretty expensive in time.

Will resort to ClassName --> classname.class.php unless we need to figure out the filename from the class name.