new entity
getter setter for teaching
class name correction
new system for adding prof
professor is addable in classe
professor is removable from teaching
each discipline has status about assigned teacher
fixing wrong path of Level and Chapter
Adding level in chapter
removing level from exerciseFIle
all bug corrected for exercise bundle
empty case for removing professor or student handled
empty array
Bundle Note
Bundle Note
Bundle Note
Merge branch 'development' of https://github.com/Kuro456/athena into Kuro456-development

Conflicts:
	app/AppKernel.php
	app/Resources/views/base.html.twig
	app/config/routing.yml
	src/Ath/CoursBundle/Entity/Discipline.php
	src/Ath/PageBundle/Controller/PageController.php
composer.lock
variable checking
Merge branch 'cours' into dev22

Conflicts:
	src/Ath/UserBundle/Resources/views/Registration/classe.edit.html.twig