tgriesser/knex — pull request #572 by PhilWaldmann (2014-11-20 19:59:28+00:00)
Title: add nested having support

`where` supports nested conditions via

```js
.where(function(){
this.orWhere(...);
this.orWhere(...)
});
```

with this PR the same is possible for `having`

```js
.having(function(){
this.orWhere(...);
this.orWhere(...)
});
```

I've included 2 simple tests