mobile:false & live:true on mobile devices produces error

Hi,

very handy tool!

One thing I stumbled upon... If I set `mobile:false` and `live:true` then every time I inject new animated content into the DOM I got following error in Safari / iPhone:

```
[Error] TypeError: 'undefined' is not a function (evaluating 'this.boxes.push(box)')
	doSync (js_HnW_Tw9uLX_fgIL4NiMOSW1jlZrweLfoLvnpdT6YinI.js, line 190)
	(anonyme Funktion) (js_HnW_Tw9uLX_fgIL4NiMOSW1jlZrweLfoLvnpdT6YinI.js, line 150)
	(anonyme Funktion) (js_HnW_Tw9uLX_fgIL4NiMOSW1jlZrweLfoLvnpdT6YinI.js, line 153)
```