How to user raw with orderBy

Previously used to do:

``` javascript
qb.orderBy(knex.raw('RANDOM()'));
```

Now it fails:

``` javascript
sql: 'select "items".* from "items" order by "[object Object]", "RANDOM()", "", "undefined", "undefined" asc limit $1' }
error: zero-length delimited identifier at or near """"
```
