change sass_atof to be thread safe
change sass_atof to be thread safe

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