Fix global scope issue when working with noConflict

Hi,

I think there might be a problem with the ***noConflict***-method. When you execute the following code the device object is still bound to "window.device" inside of the device.js IEF e.g.:

```
var devicejs = device.noConflict();
var device = new YourOtherDeviceObject();
devicejs.desktop();
```
Therefor you receive the following error:
```
devicejs.desktop()
TypeError: undefined is not a function
```

Cheers,

Alex