Adding Kibana dashboard

:warning: Work In Progress :warning: 

__Hello!__

You did a great job with this cartridge, thanks! I am adding a kibana dashboard in there, what do you think?

Check it live here: http://es-pbonaud.rhcloud.com/index.html
Hi @popox.
Now **you** are doing a great job :+1: 

I've found just a little issue in nginx config. For some obscure reason, it is serving ES from URL `/`, ignoring the `index` directive. In order to reach kibana, one must request `/index.html`, which seams a little cumbersome.

I could bypass it by adding this before `location /`:

```nginx
    # Kibana URI is /kibana
    location ~ ^/kibana/?$ {
        try_files /index.html =404;
    }
```

What do you think?