added what is necessary for having proxyError on Routing proxywq

lib/node-http-proxy/routing-proxy.js

@@ -90,6 +90,8 @@ RoutingProxy.prototype.add = function (options) {
   });
   
   this.proxies[key] = new HttpProxy(options);
+  this.proxies[key].on('proxyError', this.emit.bind(this, 'proxyError'));
+  this.proxies[key].on('webSocketProxyError', this.emit.bind(this, 'webSocketProxyError'));
 };
 
 //
@@ -183,6 +185,7 @@ RoutingProxy.prototype.proxyRequest = function (req, res, options) {
   
   if (!this.proxies[key]) {
     this.add(options);
+    
   }    
   
   proxy = this.proxies[key];
@@ -220,7 +223,7 @@ RoutingProxy.prototype.proxyWebSocketRequest = function (req, socket, head, opti
 
   if (!this.proxies[key]) {
     this.add(options);
-  }    
+  }
 
   proxy = this.proxies[key];      
   proxy.proxyWebSocketRequest(req, socket, head, options.buffer);
@@ -244,4 +247,4 @@ RoutingProxy.prototype._getKey = function (options) {
     options.host || options.target.host, 
     options.port || options.target.port
   ].join(':');
-}
\ No newline at end of file
+}