Python 3 compatibility patch
Fixed bug in Python 3 compatibility (raw_input instead of input). Caught by Johnny Greco, tested on iMac running MacOS HighSierra and anaconda python 3.6.5
Fixed bug in Python 3 compatibility (raw_input instead of input). Caught by Johnny Greco, tested on iMac running MacOS HighSierra and anaconda python 3.6.5