Excel report lesson headers now display the name of the lesson instead of lesson id - refs BT#8528

Conflicts:
	main/inc/lib/sessionmanager.lib.php
Add library Symfony Debug version 2.5.5
Add library Symfony Finder version 2.5.5
Add library Symfony Filesystem version 2.5.5
Add library Illuminate Database version 4.2.9
Add configuration to database
Add namespace Chamilo to composer
Add model User
Add model Section
Add model Course
Add model QuizQuestion
Add model TrackExercices
Add component Tracking
Fix evaluation detail report, reporting > admin
Merge pull request #1 from danilobrinu/master

Fix lesson report, now display the name of the lesson