Moves XNA 4 files for Github migration.

Plan B Html Parser/Nodes/HtmlDocumentNode.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace PlanB.Html.Nodes
+{
+    public class HtmlDocumentNode: HtmlNode
+    {
+        public HtmlDocumentNode()
+        {
+            Type = HtmlNodeType.Document_;
+        }
+
+        public override string InnerHtml
+        {
+            get
+            {
+                StringBuilder sb = new StringBuilder();
+
+                foreach (HtmlNode child in Children)
+                {
+                    sb.Append(child.OuterHtml);
+                }
+
+                return sb.ToString();
+            }
+        }
+
+        public override string OuterHtml
+        {
+            get
+            {
+                return InnerHtml;
+            }
+        }
+
+
+
+
+
+        public override string TagName
+        {
+            get { return "_Document"; }
+        }
+    }
+}