WebSocket Message BroadCaster

HTTP WebSocket Message BroadCaster A WebSocket server to broadcast messages to all clients. Can be used for example as a chat application or WebRTC signaling on a LAN. Based on Google Chrome [app samples](https://github.com/GoogleChrome/chrome-app-samples/tree/master/samples/websocket-server). Used along with Serverless-WebRTC example: https://github.com/frequent/nexedi-serverless-test