Couple issues running with Xamarin.iOS

Found a couple issues trying test this with a Xamarin.iOS app:
* I couldn't run this with the Indie Xamarin license since it references System.Data.SqlClient. However, this wasn't necessary since it uses Sqlite. I changed the SqlParameters to SqliteParameters and was able to get it to compile.
* Got a null reference when calling SharedManager.GetDatabase("something"). This seems to be because the logic to validate the name is reversed. After I changed that I was able to get a Database object back.