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=caae082025f13dd47054c1324888f6eeb317088c
http://github.com/moodle/moodle/commit/caae082025f13dd47054c1324888f6eeb317088c
+ 3.5 en [getrecaptchaapi,core_auth]