Improve hash map key handling
Improve hash map key handling

Implement a few other key types

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