using websocketAddress config if supplied

public/src/app.js

@@ -100,7 +100,7 @@ var socket,
 				ioParams.transports = ['xhr-polling'];
 			}
 
-			socket = io.connect('', ioParams);
+			socket = io.connect(config.websocketAddress, ioParams);
 			reconnecting = false;
 
 			socket.on('event:connect', function (data) {

src/controllers/api.js

@@ -35,6 +35,7 @@ apiController.getConfig = function(req, res, next) {
 	config.disableSocialButtons = parseInt(meta.config.disableSocialButtons, 10) === 1;
 	config.maxReconnectionAttempts = meta.config.maxReconnectionAttempts || 5;
 	config.reconnectionDelay = meta.config.reconnectionDelay || 200;
+	config.websocketAddress = meta.config.websocketAddress || '';
 	config.tagsPerTopic = meta.config.tagsPerTopic || 5;
 	config.topicsPerPage = meta.config.topicsPerPage || 20;
 	config.postsPerPage = meta.config.postsPerPage || 20;