Add course about Git
Add amend, revert
Add git HOWTOs
Improvements advised by Olivier Bonaventure
Add manpages
Fix warnings in Git
Remove duplicated description of config
Add 2 contributors scenario for Git
Fix syntax highlights for Git
Remove done TODOs
Ajout du texte sur les outils ecrits par Maxime Demol, Nicolas Houtain et Benoit Legat
Merge remote-tracking branch 'upstream/git'
Ajout de la description sur git ecrite par Benoit Legat