Refactored output to test full buffer for utf8
Refactored output to test full buffer for utf8

Fixes https://github.com/sass/libsass/issues/820

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