Added AlexManga to the list of contributors
Issue #39 resolved
Issue #64 Favicon

add favicon
Added Axel Ajavon, Karim Smaili, Maxime Lecoq to the list of authors
Added Antoine Mazelin to the list of authors
Isssue #46

Added a click listener on "menu_top_left" in order to remove the class
"scrolledleft" for "welcome".