Fix share dialog on iOS 7 (fixes #27)
Fix share dialog on iOS 7 (fixes #27)

junian/Xamarin.Social,moljac/Xamarin.Social,pacificIT/Xamarin.Social,aphex3k/Xamarin.Social,aphex3k/Xamarin.Social,xamarin/Xamarin.Social,xamarin/Xamarin.Social,junian/Xamarin.Social,moljac/Xamarin.Social,pacificIT/Xamarin.Social