Updated to only try and extend things that have content and will therefore be output later. Added some new debugging prints to help track down recursion issues. Update Compound_Selector printing to match ruby sass.
Updated to only try and extend things that have content and will therefore be output later. Added some new debugging prints to help track down recursion issues. Update Compound_Selector printing to match ruby sass.

am11/libsass,am11/libsass,mikebarkas/libsass,errorx666/libsass,mtwebster/mint-libsass,FishingCactus/libsass,TBAPI-0KA/NSass,TBAPI-0KA/NSass,errorx666/libsass,FishingCactus/libsass,mtwebster/mint-libsass,saper/libsass,mikebarkas/libsass,mtwebster/mint-libsass,webdev1001/libsass,panicinc/libsass,saper/libsass,saper/libsass,TBAPI-0KA/NSass,admire93/libsass-python,TBAPI-0KA/NSass,khchanel/libsass,mtwebster/mint-libsass,admire93/libsass-python,khchanel/libsass,webdev1001/libsass,webdev1001/libsass,TBAPI-0KA/NSass,saper/libsass,khchanel/libsass,saper/libsass,mikebarkas/libsass,FishingCactus/libsass,khchanel/libsass,webdev1001/libsass,mikebarkas/libsass,FishingCactus/libsass,errorx666/libsass,errorx666/libsass,khchanel/libsass,webdev1001/libsass,technoAri/libsass,panicinc/libsass,mtwebster/mint-libsass,am11/libsass,mikebarkas/libsass,am11/libsass,dahlia/libsass-python,am11/libsass,TBAPI-0KA/NSass,FishingCactus/libsass,panicinc/libsass,technoAri/libsass,technoAri/libsass,panicinc/libsass,technoAri/libsass,panicinc/libsass,dahlia/libsass-python,technoAri/libsass