Moves XNA 4 files for Github migration.

Plan B Html Parser/Nodes/HtmlSpanNode.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace PlanB.Html.Nodes
+{
+    public class HtmlSpanNode: HtmlNode
+    {
+        public HtmlSpanNode()
+        {
+            Type = HtmlNodeType.Span;
+        }
+
+        public HtmlSpanNode(String text)
+            :this()
+        {
+            Children.Add(new HtmlTextNode(text));
+        }
+
+        public HtmlSpanNode(IEnumerable<HtmlNode> children)
+            :this()
+        {
+            foreach (HtmlNode child in children)
+            {
+                Children.Add(child);
+            }
+        }
+
+        public override string TagName
+        {
+            get { return StaticTagName; }
+        }
+
+        public static string StaticTagName { get { return "span"; } }
+    }
+}