Nettoyage code HTML de l'overlay
1er essais
#19 : mixin rem-size debug
Merge branch 'master' into feature/remove-ie-comments

Conflicts:
	assets/css/oldie.css
	assets/css/sass/libs/_sawmill.scss
	assets/css/tiny.css
Régénération des CSS
Merge branch 'master' into version/2.0.0
_resets.scss : ajustement des paramètres pour IE
Suppression de l'IE mode du .htaccess & ajout de la balise de meta données
Suppression des lignes de tests.
Merge branch 'feature/remove-ie-comments' into version/2.0.0
Merge branch 'version/2.0.0' into feature/mixin-placeholder