Removed null check that was causing type error.
Fix C++11 compile on GNU
Only print debug spew on DEBUG builds
Merge branch 'feature/extend-support-subweave' of github.com:DealerDotCom/libsass into feature/extend-support-subweave
Merge remote-tracking branch 'origin/feature/extend-support-subweave' into feature/extend-support-subweave-local-osx-10.8.5

Conflicts:
	Makefile