Added -ms-box-sizing to bring parity between SCSS & LESS
Added -ms-box-sizing to bring parity between SCSS & LESS

@jonikorpi committed @8bb17f7a9fd28f9af364, and this brings the .SCSS
version of the file up-to-date.

jonikorpi/Golden-Grid-System,aoimedia/Golden-Grid-System,noikiy/Golden-Grid-System,nhatlan/Golden-Grid-System