Added python-setuptools for ubuntu install howto
Added python-setuptools for ubuntu install howto

You need to install the package python-setuptools on Ubuntu 16.04/Mint 18 to use the setup.py for the STIX installation.
MISP/MISP,FIRSTdotorg/MISP,FloatingGhost/MISP,SteveClement/MISP,SteveClement/MISP,devnull-/MISP,SteveClement/MISP,crruthe/MISP,crruthe/MISP,TheDr1ver/MISP,FIRSTdotorg/MISP,TheDr1ver/MISP,cristianbell/MISP,SteveClement/MISP,SteveClement/MISP,devnull-/MISP,crruthe/MISP,MISP/MISP,MISP/MISP,FIRSTdotorg/MISP,cristianbell/MISP,cristianbell/MISP,FloatingGhost/MISP,Rafiot/MISP,FloatingGhost/MISP,cristianbell/MISP,devnull-/MISP,Rafiot/MISP,MISP/MISP,Rafiot/MISP,FIRSTdotorg/MISP,TheDr1ver/MISP,devnull-/MISP,FloatingGhost/MISP,crruthe/MISP,Rafiot/MISP,MISP/MISP,TheDr1ver/MISP