method realise(List<NLGElement> elements) inside the Realiser.java is not implemented.

```
@Override
    public List<NLGElement> realise(List<NLGElement> elements) {
        return null;
    }

I'm using SimleNlg version 4.4 . It seems like the above method is not 
implemented, probably an oversight. 
```

Original issue reported on code.google.com by `Albi.1...@gmail.com` on 7 Feb 2013 at 2:44
