Fix `str-slice` function to work with utf8 strings
Fix `str-slice` function to work with utf8 strings

FishingCactus/libsass,TBAPI-0KA/NSass,am11/libsass,am11/libsass,mtwebster/mint-libsass,saper/libsass,errorx666/libsass,FishingCactus/libsass,mtwebster/mint-libsass,mtwebster/mint-libsass,khchanel/libsass,panicinc/libsass,TBAPI-0KA/NSass,khchanel/libsass,am11/libsass,errorx666/libsass,FishingCactus/libsass,technoAri/libsass,panicinc/libsass,technoAri/libsass,errorx666/libsass,saper/libsass,mikebarkas/libsass,mtwebster/mint-libsass,panicinc/libsass,mtwebster/mint-libsass,mikebarkas/libsass,khchanel/libsass,saper/libsass,mikebarkas/libsass,am11/libsass,khchanel/libsass,khchanel/libsass,panicinc/libsass,FishingCactus/libsass,mikebarkas/libsass,technoAri/libsass,saper/libsass,technoAri/libsass,TBAPI-0KA/NSass,TBAPI-0KA/NSass,TBAPI-0KA/NSass,am11/libsass,FishingCactus/libsass,saper/libsass,technoAri/libsass,mikebarkas/libsass,panicinc/libsass,errorx666/libsass,TBAPI-0KA/NSass