Verify server is at least mongodb 2.6

gistfile1.txt

    self.db.command({ 'serverStatus': 1 }, function(err, result) {
      if (err) {
        return callback(err);
      }
      var versions = result.version.split(/\./);
      if ((versions[0] < 2) || ((versions[0] == 2) && (versions[1] < 6))) {
        return callback(new Error('\n\nMONGODB TOO OLD: your server must be at least MongoDB 2.6.0.\nYou currently have: ' + result.version));
      }
      return callback(null);
    });