Merge pull request #67 from EmaInfres5ED/yohanDev

Yohan dev
Adapt with new model
Merge pull request #68 from EmaInfres5ED/cybema

Merged by Matthieu with my account
Use promoId to find the student, handle the case with 0 absences and 0 retards
Implement custom DQL request for Absence and Retard, use them
Merge branch 'master' of github.com:EmaInfres5ED/Emargement-Web into yohanDev