add support for websockets api

lib/index.js

@@ -6,5 +6,12 @@ const initializer = (accountSid, apiKey, opts) => {
 
 initializer.Jambonz = Jambonz;
 initializer.WebhookResponse = require('./jambonz/webhook-response');
+initializer.WsRouter = require('./jambonz/ws-router');
+initializer.WsSession = require('./jambonz/ws-session');
+initializer.handleProtocols = (protocols) => {
+  if (!protocols.has('ws.jambonz.org')) return false;
+  return 'ws.jambonz.org';
+};
+
 
 module.exports = initializer;