Author: Damyon Wiese
MDL-31341: Add custom completion rule to assignment: 'submit'
http://git.moodle.org/gw?p=moodle.git;a=commit;h=79ed4d8475c79e8eefce33d114d4e27c6932efce
http://github.com/moodle/moodle/commit/79ed4d8475c79e8eefce33d114d4e27c6932efce
+ 2.4 en [completionsubmit,mod_assign]