admin cleanup

removed unnecessary admin checks in src/admin/user then realized they
are just one liners so moved them to src/socket.io.admin.js moved
categories update to categories folder

src/categories/update.js

@@ -0,0 +1,46 @@
+
+'use strict';
+
+var async = require('async'),
+	db = require('./../database'),
+	utils = require('./../../public/src/utils');
+
+
+module.exports = function(Categories) {
+
+	Categories.update = function(modified, callback) {
+
+		function updateCategory(cid, next) {
+			var category = modified[cid];
+			var fields = Object.keys(category);
+
+			async.each(fields, function(key, next) {
+				updateCategoryField(cid, key, category[key], next);
+			}, next);
+		}
+
+		function updateCategoryField(cid, key, value, next) {
+			db.setObjectField('category:' + cid, key, value, function(err) {
+				if(err) {
+					return next(err);
+				}
+
+				if (key === 'name') {
+					var slug = cid + '/' + utils.slugify(value);
+					db.setObjectField('category:' + cid, 'slug', slug, next);
+				} else if (key === 'order') {
+					db.sortedSetAdd('categories:cid', value, cid, next);
+				} else {
+					next();
+				}
+			});
+		}
+
+		var cids = Object.keys(modified);
+
+		async.each(cids, updateCategory, function(err) {
+			callback(err, cids);
+		});
+	};
+
+};