Author: Jean-Michel Vedrine
MDL-27930 Lesson: the count-down timer does not work
http://git.moodle.org/gw?p=moodle.git;a=commit;h=0db87f6d4a784c85ce63b453239395d39ffd3935
http://github.com/moodle/moodle/commit/0db87f6d4a784c85ce63b453239395d39ffd3935
+ 2.7 en [timeisup,mod_lesson]