Contributions from my implementation

Hi Nic,

As promised, here are the salient differences from my implementation of the AYAH CAPTCHA replacement for mediawiki.

The commit messages give a fair overview of what's changed, but in brief: add no javascript support, add a couple of optimisations and update API calls to remove deprecated functions.

Ed: also fix minor bug in message name for 'help' special page.

BTW: For some reason, AYAH.com mentioned your implementation to me, <a href="http://portal.areyouahuman.com/installation/mediawiki">have a page</a> on their website for it, but their <a href="http://portal.areyouahuman.com/installation/">main installation options portal page</a> still doesn't list it — so people aren't going to know about it.

Strix.