change batch.js style

src/batch.js

@@ -2,15 +2,13 @@
 
 'use strict';
 
-var async = require('async'),
+var async = require('async');
-	db = require('./database'),
+var db = require('./database');
-	utils = require('../public/src/utils');
+var utils = require('../public/src/utils');
-
-(function (Batch) {
 
 var DEFAULT_BATCH_SIZE = 100;
 
-	Batch.processSortedSet = function (setKey, process, options, callback) {
+exports.processSortedSet = function (setKey, process, options, callback) {
 	if (typeof options === 'function') {
 		callback = options;
 		options = {};
@@ -63,7 +61,7 @@ var async = require('async'),
 	);
 };
 
-	Batch.processArray = function (array, process, options, callback) {
+exports.processArray = function (array, process, options, callback) {
 	if (typeof options === 'function') {
 		callback = options;
 		options = {};
@@ -110,5 +108,3 @@ var async = require('async'),
 		}
 	);
 };
-
-}(exports));