remove broken rotation code

Renderer.cs

@@ -267,7 +267,7 @@ namespace Kav
             foreach (var sprite in sprites)
             {
                 // transform view space on CPU so we don't have to break the batch
-                Vector3 viewSpacePosition = Vector3.Transform(sprite.Position, camera.View * Matrix.CreateRotationX(sprite.Rotation) * invertY);
+                Vector3 viewSpacePosition = Vector3.Transform(sprite.Position, camera.View * invertY);
 
                 SpriteBatch.Draw(
                     sprite.Texture,