Merge pull request #6 from Senorihl/master

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Merge pull request #7 from Senorihl/master

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added control on empty room & on free students
changed periodicity_end to nb_repetition in form
dummy commit
Ajout de la vérification en cas de repetition d'évènement + layout de visualisation de schedule
Merge pull request #8 from Senorihl/master

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Edit lesson for add default value if teachers is not set
Merge pull request #20 from romaricboufatis/master

resolution bug à l'affichage d'un cours
Merge pull request #14 from Senorihl/master

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