Added polyfills for IE8
Added polyfills for IE8

vincentsels/themes-gnap,infrabel/themes-gnap,infrabel/themes-gnap,vincentsels/themes-gnap,vincentsels/themes-gnap,infrabel/themes-gnap,infrabel/themes-gnap,vincentsels/themes-gnap,infrabel/themes-gnap,infrabel/themes-gnap,vincentsels/themes-gnap,vincentsels/themes-gnap