Fix Stroustrup's name
add mention of -Wall option
Clarify explanation of #if directive
add reference in bibliography
Add precision concerning references
Fix code examples
Fix typos
Clarify some things in td_classes
Clarify things in td_nombre_aleatoire
Fix typos
Remove misleading questions from TD
Ajoute les démos du cours sur le compilateur
fix typo
letter superscript may be confusing
Merge branch 'ylep-master'