function spawnColorizer(callback) {
  var child = spawn(process.execPath, [targetScript], { stdio: 'pipe' });
  var data = '';

  child.stdout.setEncoding('utf8')
  child.stdout.on('data', function (str) { data += str; });
  child.on('close', function () {
    callback(null, data);
  });
}
Spawns the colorizer helper process for checking
if colors work in a non-tty environment