Reinstate func_registry, for back compat.
Reinstate func_registry, for back compat.

cpfair/pyScss,Kronuz/pyScss,Kronuz/pyScss,hashamali/pyScss,hashamali/pyScss,Kronuz/pyScss,cpfair/pyScss,hashamali/pyScss,Kronuz/pyScss,cpfair/pyScss