code: function getMostRecentFilename (callback) {
    getLogFiles(function (err, files) {
      if (err) {
        callback(err, null);
      } else if (!files || files.length === 0) {
        return callback(null, Date.now().toString().concat(FILE_EXT));
      } else {
        var file = _.max(files, function (f) {
          var n = (f && typeof f.name === 'string') ? f.name : f;
  
          // Remove extension to get just the timestamp
          var ts = n.replace(FILE_EXT, '');
  
          return parseInt(ts, 10);
        });
  
        var n = (file && typeof file.name === 'string') ? file.name : file;
  
        callback(null, n);
      }
    });
  }
docs: Get the name of the most recent log file
  @param  {Array}    files
  @param  {Function} callback