fixed issues caused by inadvertant globalisation (and its subsequent fix)

src/posts.js

@@ -6,6 +6,7 @@ var RDB = require('./redis.js'),
 	favourites = require('./favourites.js'),
 	threadTools = require('./threadTools.js'),
 	postTools = require('./postTools'),
+	categories = require('./categories'),
 	feed = require('./feed.js'),
 	async = require('async'),
 	plugins = require('./plugins'),

src/webserver.js

@@ -24,6 +24,7 @@ var express = require('express'),
 	nconf = require('nconf'),
 	winston = require('winston'),
 	validator = require('validator'),
+	async = require('async'),
 	logger = require('./logger.js');
 
 (function (app) {