Author: Jean-Michel Vedrine
MDL-48244 Lesson: add custom end of lesson reached completion rule
http://git.moodle.org/gw?p=moodle.git;a=commit;h=25345cb4cd2366be97264f7479aff774ae5397b4
http://github.com/moodle/moodle/commit/25345cb4cd2366be97264f7479aff774ae5397b4
+ 2.9 en [completionendreached,mod_lesson]
+ 2.9 en [completionendreached_desc,mod_lesson]