Add support for nth with maps
Add support for nth with maps

TBAPI-0KA/NSass,webdev1001/libsass,am11/libsass,panicinc/libsass,khchanel/libsass,webdev1001/libsass,errorx666/libsass,saper/libsass,am11/libsass,FishingCactus/libsass,TBAPI-0KA/NSass,mtwebster/mint-libsass,technoAri/libsass,khchanel/libsass,am11/libsass,TBAPI-0KA/NSass,mtwebster/mint-libsass,technoAri/libsass,khchanel/libsass,khchanel/libsass,TBAPI-0KA/NSass,panicinc/libsass,FishingCactus/libsass,khchanel/libsass,mikebarkas/libsass,errorx666/libsass,webdev1001/libsass,am11/libsass,TBAPI-0KA/NSass,mtwebster/mint-libsass,mikebarkas/libsass,technoAri/libsass,panicinc/libsass,errorx666/libsass,webdev1001/libsass,mikebarkas/libsass,saper/libsass,technoAri/libsass,FishingCactus/libsass,panicinc/libsass,TBAPI-0KA/NSass,am11/libsass,FishingCactus/libsass,technoAri/libsass,saper/libsass,mikebarkas/libsass,saper/libsass,webdev1001/libsass,saper/libsass,errorx666/libsass,panicinc/libsass,mtwebster/mint-libsass,mtwebster/mint-libsass,mikebarkas/libsass,FishingCactus/libsass