Remove compass/susy dependencies

[victordarras]

Hi all, I may have some cleaning updates for the project:

• Remove Compass and its plugin Susy
• Now use Jekyll build system for stylesheets
• Remove fontello webfont, replaced by inline SVGs
• Take in consideration wrapper width modification
• Set default font-weight to normal (300 may be hard to read)

[victordarras]

@kud tu me sembles être le plus actif des mainteneurs, je m'en remet à toi :)

[kud]

Oh merde :D