Implemented error messaging, this resolves #9

Artemis/Artemis/App.xaml

@@ -1,7 +1,9 @@
 <Application x:Class="Artemis.App"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             xmlns:local="clr-namespace:Artemis">
+             xmlns:local="clr-namespace:Artemis"
+             DispatcherUnhandledException="Application_DispatcherUnhandledException"
+             Startup="Application_Startup">
     <Application.Resources>
         <ResourceDictionary>
             <ResourceDictionary.MergedDictionaries>

Artemis/Artemis/App.xaml.cs

@@ -1,4 +1,7 @@
-using System.Windows;
+using System;
+using System.Windows;
+using System.Windows.Threading;
+using WpfExceptionViewer;
 
 namespace Artemis
 {
@@ -11,5 +14,43 @@ namespace Artemis
         {
             InitializeComponent();
         }
+
+        public bool DoHandle { get; set; }
+
+        private void Application_Startup(object sender, StartupEventArgs e)
+        {
+            AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;
+        }
+
+        private void Application_DispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
+        {
+            if (DoHandle)
+            {
+                GetArtemisExceptionViewer(e.Exception).ShowDialog();
+                e.Handled = true;
+            }
+            else
+            {
+                GetArtemisExceptionViewer(e.Exception).ShowDialog();
+                e.Handled = false;
+            }
+        }
+
+
+        private void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
+        {
+            var ex = e.ExceptionObject as Exception;
+            GetArtemisExceptionViewer(ex).ShowDialog();
+        }
+
+        private static ExceptionViewer GetArtemisExceptionViewer(Exception e)
+        {
+            return new ExceptionViewer("An unexpected error occurred in Artemis.", e)
+            {
+                Title = "Artemis - Exception :c",
+                Height = 400,
+                Width = 800
+            };
+        }
     }
 }

Artemis/Artemis/AppBootStrapper.cs

@@ -15,15 +15,7 @@ namespace Artemis
 
         protected override void OnStartup(object sender, StartupEventArgs e)
         {
-            try
+            DisplayRootViewFor<ShellViewModel>();
-            {
-                DisplayRootViewFor<ShellViewModel>();
-            }
-            catch (Exception ex)
-            {
-                MessageBox.Show("Startup failed :c \n" + ex.InnerException.Message);
-                throw;
-            }
         }
     }
 }