Multiple mixed content being ignored

The following is modified example from the readme:

```js
var example5 = [{
toys: [{
_attr: {
decade: '80s',
locale: 'US'
}
},
{
toy: [{
_attr: {
decade: '80s',
locale: 'US'
}
},
'Transformers',
{
toya: [{
_attr: {
knowing: 'half the battle'
}
}, 'GI Joe']
}
]
}
]
}];
```

And it produces

```xml

Transformers
GI Joe

```

However, if another piece of mixed data is added like this:

```js
var example5 = [{
toys: [{
_attr: {
decade: '80s',
locale: 'US'
}
},
{
toy: [{
_attr: {
decade: '80s',
locale: 'US'
}
},
'Transformers',
{
toya: [{
_attr: {
knowing: 'half the battle'
}
}, 'GI Joe']
},
' and the A-team'
]
}
]
}];
```

The sub object is just ignored and the following is outputted:

```xml

Transformers and the A-team

```