Author: John Okely
MDL-53832 enrol_lti: Add interface for proxies
http://git.moodle.org/gw?p=moodle.git;a=commit;h=9a709cd5a54b345c33088b1ee2123d27b3a2836a
http://github.com/moodle/moodle/commit/9a709cd5a54b345c33088b1ee2123d27b3a2836a
+ 3.2 en [cartridgeurl,enrol_lti]
+ 3.2 en [proxyurl,enrol_lti]
+ 3.2 en [registration,enrol_lti]