fixes global meta leak, and categories meta require, #873

src/categories.js

@@ -5,6 +5,7 @@ var db = require('./database.js'),
 	topics = require('./topics.js'),
 	plugins = require('./plugins'),
 	CategoryTools = require('./categoryTools'),
+	meta = require('./meta'),
 
 	async = require('async'),
 	winston = require('winston'),

src/messaging.js

@@ -1,7 +1,7 @@
 var db = require('./database'),
 	async = require('async'),
 	user = require('./user'),
-    plugins = require('./plugins');
+	plugins = require('./plugins'),
 	meta = require('./meta');