device.name fix

device.name wasn't working in the 2.8 branch for Windows 8, it was coming back as "undefined".  This fixes device.name so that it returns the Windows device name (hostname).  I see that this feature has been depreciated however Windows can still use this to get the device name.  

device.model is not supported on Windows 8 but is included in cordova.js for Windows 8.  Not sure if this is a mix up.  The documentation probably needs to be updated too.  device.model isn't supported because there isn't a way to access the model of the device using a Windows Store app.