Updated reCaptcha to version 2.0 (thanks jce76350 for the headsup).
PLEASE NOTE:
- the new reCaptcha is not compatible with the previous 1.x releases;
- the secret keys used by the previous version of reCaptcha are not valid for reCaptcha 2.0, you need to get a pair expecific for reCaptcha 2.0;
- the secret keys have now different labels for reCaptcha 2.0: instead of publickey and privatekey, these are now site key and secret;