traverse file if it is a directory otherwise setup the watcher
function traverse(file) {
      file = master.resolve(file);
      fs.stat(file, function(err, stat){
        if (!err) {
          if (stat.isDirectory()) {
            if (~exports.ignoreDirectories.indexOf(basename(file))) return;
            fs.readdir(file, function(err, files){
              files.map(function(f){
                return file + '/' + f;
              }).forEach(traverse);
            });
          } else {
            watch(file);
          }
        }
      });
    }