Change filename casing of classes/ocookie.php to fix a problem where the class won't autoload on operating systems where filenames are case sensitive.

Signed-off-by: Martijn - mindcontrolled <github@mindcontrolled.nl>
Fix a bug where UNIX epoch (timestamp 0) + $lifetime in seconds was used as the cookie expiry time, making cookies expire immediately after the browser receives them. This should be the current time as UNIX timestamp + $lifetime.

Signed-off-by: Martijn - mindcontrolled <github@mindcontrolled.nl>