Author: Jeff Webster
MDL-48501 recaptchalib_v2: add new lib to support reCAPTCHA v2
http://git.moodle.org/gw?p=moodle.git;a=commit;h=68e6299010da2d2fa8f5c5690f0167ec6ef1ba08
http://github.com/moodle/moodle/commit/68e6299010da2d2fa8f5c5690f0167ec6ef1ba08
+ 3.3 en [getrecaptchaapi,core_auth]