First pass at navigation with MasterDetail

Aurora/Frontend/Converters/InverseBoolConverter.cs

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+using System;
+using System.Globalization;
+using Xamarin.Forms;
+
+namespace Aurora.Frontend.Converters
+{
+    public class InverseBoolConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (!(value is bool))
+            {
+                throw new InvalidOperationException("The target must be a boolean");
+            }
+
+            return !(bool)value;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return null;
+        }
+    }
+}

Aurora/Frontend/Converters/ToUpperConverter.cs

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+using System;
+using System.Globalization;
+using Xamarin.Forms;
+
+namespace Aurora.Frontend.Converters
+{
+    public class ToUpperConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return value.ToString().ToUpper();
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return null;
+        }
+    }
+}