webconsole: support websocket proxy

vendor/github.com/koding/websocketproxy/README.md

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+# WebsocketProxy [![GoDoc](https://godoc.org/github.com/koding/websocketproxy?status.svg)](https://godoc.org/github.com/koding/websocketproxy) [![Build Status](https://travis-ci.org/koding/websocketproxy.svg)](https://travis-ci.org/koding/websocketproxy)
+
+WebsocketProxy is an http.Handler interface build on top of
+[gorilla/websocket](https://github.com/gorilla/websocket) that you can plug
+into your existing Go webserver to provide WebSocket reverse proxy.
+
+## Install
+
+```bash
+go get github.com/koding/websocketproxy
+```
+
+## Example
+
+Below is a simple server that proxies to the given backend URL
+
+```go
+package main
+
+import (
+	"flag"
+	"net/http"
+	"net/url"
+
+	"github.com/koding/websocketproxy"
+)
+
+var (
+	flagBackend = flag.String("backend", "", "Backend URL for proxying")
+)
+
+func main() {
+	u, err := url.Parse(*flagBackend)
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	err = http.ListenAndServe(":80", websocketproxy.NewProxy(u))
+	if err != nil {
+		log.Fatalln(err)
+	}
+}
+```
+
+Save it as `proxy.go` and run as:
+
+```bash
+go run proxy.go -backend ws://example.com:3000
+```
+
+Now all incoming WebSocket requests coming to this server will be proxied to
+`ws://example.com:3000`
+
+