change style of meta.js

src/meta.js

@@ -8,7 +8,8 @@ var nconf = require('nconf');
 var pubsub = require('./pubsub');
 var utils = require('./utils');
 
-(function (Meta) {
+var Meta = module.exports;
+
 Meta.reloadRequired = false;
 
 require('./meta/configs')(Meta);
@@ -75,4 +76,3 @@ var utils = require('./utils');
 		winston.error('[meta.restart] Could not restart, are you sure NodeBB was started with `./nodebb start`?');
 	}
 }
-}(exports));