Changed default namespace

samples/XamlTestApplication/Views/MainWindow.xaml

@@ -1,5 +1,5 @@
 <Window x:Class="XamlTestApplication.MainWindow"
-        xmlns="https://github.com/grokys/Perspex"
+        xmlns="https://github.com/perspex"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
         Title="Perspex Test Application" Height="350" Width="525">
     <Grid RowDefinitions="Auto,*">

src/Markup/Perspex.Markup.Xaml/Context/PerspexWiringContext.cs

@@ -22,7 +22,7 @@ namespace Perspex.Markup.Xaml.Context
     public class PerspexWiringContext : IWiringContext
     {
         private readonly WiringContext _context;
-        private const string PerspexNs = "https://github.com/grokys/Perspex";
+        private const string PerspexNs = "https://github.com/perspex";
 
         public PerspexWiringContext(ITypeFactory typeFactory)
         {