Fix some namespacing issues

Stylet/Properties/AssemblyInfo.cs

@@ -23,7 +23,7 @@ using System.Windows.Markup;
 // The following GUID is for the ID of the typelib if this project is exposed to COM
 [assembly: Guid("a557a739-6b61-44d2-a431-889bc11aac9e")]
 
-[assembly: XmlnsDefinition("https://github.com/canton7/Stylet", "Stylet")]
+[assembly: XmlnsDefinition("https://github.com/canton7/Stylet", "Stylet.Xaml")]
 
 // Version information for an assembly consists of the following four values:
 //

Stylet/Xaml/ActionExtension.cs

@@ -8,7 +8,7 @@ using System.Windows;
 using System.Windows.Input;
 using System.Windows.Markup;
 
-namespace Stylet
+namespace Stylet.Xaml
 {
     public enum ActionUnavailableBehaviour
     {

Stylet/Xaml/CommandAction.cs

@@ -11,7 +11,7 @@ using System.Windows.Input;
 
 using Expressions = System.Linq.Expressions;
 
-namespace Stylet
+namespace Stylet.Xaml
 {
     /// <summary>
     /// ICommand returned by ActionExtension for binding buttons, etc, to methods on a ViewModel.

Stylet/Xaml/EventAction.cs

@@ -7,7 +7,7 @@ using System.Text;
 using System.Threading.Tasks;
 using System.Windows;
 
-namespace Stylet
+namespace Stylet.Xaml
 {
     /// <summary>
     /// Created by ActionExtension, this can return a delegate suitable adding binding to an event, and can call a method on the View.ActionTarget

StyletUnitTests/ActionExtensionTests.cs

@@ -1,6 +1,7 @@
 using Moq;
 using NUnit.Framework;
 using Stylet;
+using Stylet.Xaml;
 using System;
 using System.Collections.Generic;
 using System.Linq;