Feature/websocket example

modified express-ws and added it to our app
added an example for websockets
if you absolutely have to use an array, dont mix it with the normal app-configuration.

keep everything as it was and add the array

i.e. keep
```
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: false}));
...
```

also: either use push or inline definition for the array, but not both

imho you should rename the array to something like wsMiddleware to keep naming more consistent.