Minor add-ons

Hi,

I did some minor add-ons to the iOS assembly. I've changed the toolbar width, so it can also be used with iPads. There was an issue with the shutter animation: The camera iris stuck in closed position when the app was relaunched after entering the background. So I've released the resources explicitly before creating a new View Controller. 

Then I've added a property to check whether or not the current iOS device has a flash (-> iPad). The flash button will now only be shown if a flash is available. And last but not least I've added translations to the default View Controller and the Surface View.

I've tested my changes with iPhone 4 and 5 and also with iPad 2 und 3. If you like it, please merge it to your repository. Thanks.

Regards,
Andreas