code: function saveSync(taskName) {
    if(!this.config.savefile) return null;
    var json = loadSync.call(this) || {};
    json[taskName] = new Date().getTime();
    fs.writeFile(this.config.savefile, JSON.stringify(json), { encoding: 'utf8' }, function(err) {
      if(err) {
        log.warn('Crux.tasks: failed to save dumpfile.');
      }
    });
  }
docs: /*
  Saves sync information to the disk.