use system()s boolean return value on windows
use system()s boolean return value on windows

Jwata/gist-old,ConradIrwin/jist,zmwangx/gist,roxyboy/jist,retrography/gist,ConradIrwin/gist,flores/gist,defunkt/gist,eLobato/gist,bchase/gist,mofodox/gist,ryanbradynd05/gist,roxyboy/gist,ConradIrwin/gist,dLobatog/gist,mattn/gist