Feature request: orderBy()->where()->take()->get();

Hi,

would it possible to allow combinations of orderBy with where? Something like this:

``` PHP
AnotherModel::orderBy('created_at', 'desc')->where('some_id', '=', new MongoID((string) $model->_id))->take(1)->get();
```

This would be really cool to have. Please correct me, if there already should be a feature like this available!

Thanks in advance!
