Update setup.py to know about scss.functions.
Update setup.py to know about scss.functions.

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