Fixed a bug with ReplaceText which was not preserving text formatting.

ConsoleApplication3/Program.cs

         static void Main(string[] args)
         {
             // Create a document.
-            using (DocX document = DocX.Load(@"C:\Users\cathal\Downloads\foo.docx"))
+            using (DocX document = DocX.Load(@"Test.docx"))
             {
-                List<Picture> pictures = document.Pictures;
-
-                List<Novacode.Table> imageTable = (from table in document.Tables
-                                                   where table.Pictures.Count > 0
-                                                   select table).ToList();
-
+                document.ReplaceText("Hio", "World");
+                document.SaveAs("Test2.docx");
             }// Release this document from memory.
         }
     }

DocX/Paragraph.cs

         /// <param name="formatting">The text formatting.</param>
         public void InsertText(int index, string value, bool trackChanges=false, Formatting formatting = null)
         {
-            #region Default values for optional parameters must be compile time constants.
-            // Would like to have written 'Formatting formatting = new Formatting())
-            if (formatting == null) formatting = new Formatting(); 
-            #endregion
-
             // Timestamp to mark the start of insert
             DateTime now = DateTime.Now;
             DateTime insert_datetime = new DateTime(now.Year, now.Month, now.Day, now.Hour, now.Minute, 0, DateTimeKind.Utc);