Merge pull request #383 from mattjphillips/add_import_node

Add ImportNode() to XmlDocument.

Author: nikhilk

src/Libraries/Web/Xml/XmlDocument.cs

@@ -59,5 +59,9 @@ public XmlNode CreateProcessingInstruction(string target, string data) {
         public XmlText CreateTextNode(string text) {
             return null;
         }
+
+        public XmlNode ImportNode(XmlNode externalNode, bool deep) {
+            return null;
+        }
     }
 }