Added RawDocument property to the IndexInfo class.

Driver/Core/GetIndexesResult.cs

@@ -191,6 +191,13 @@ namespace MongoDB.Driver {
             }
         }
 
+        /// <summary>
+        /// Gets the raw BSON document containing the index information.
+        /// </summary>
+        public BsonDocument RawDocument {
+            get { return document; }
+        }
+
         /// <summary>
         /// Gets the version of the index.
         /// </summary>