Utilisation de template pour faire un menu commun aux vues #108
Merge remote-tracking branch 'origin/dev' into dev

Conflicts:
	grails-app/views/problem/create.gsp
	grails-app/views/problem/edit.gsp
	grails-app/views/problem/index.gsp
	grails-app/views/problem/my_problems.gsp
	grails-app/views/problem/problems_to_validate.gsp
	grails-app/views/problem/show.gsp
	grails-app/views/problem/valid_problems.gsp