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=4a09cd7dada88a47884d2fb18a34384929fc030c
http://github.com/moodle/moodle/commit/4a09cd7dada88a47884d2fb18a34384929fc030c
+ 3.2 en [getrecaptchaapi,core_auth]