Refactor client codes to use similar, standardized API

clients/csharp/Example.cs

@@ -7,8 +7,8 @@ class Program
     {
         using (var t = new PipeIO("in", "out"))
         {
-            t.reader.OnMessage += (String msg) => t.writer.SendMessage(msg);
-            t.reader.Run();
+            t.Reader.OnMessage += (String msg) => t.Writer.SendMessage(msg);
+            t.Reader.Run();
         }
     }
 }

clients/csharp/PipeIO.cs

@@ -65,19 +65,19 @@ namespace Pipe.IO
 
     public class PipeIO : IDisposable
     {
-        public PipeReader reader;
-        public PipeWriter writer;
+        public PipeReader Reader;
+        public PipeWriter Writer;
 
         public PipeIO(String in_pipe_path, String out_pipe_path)
         {
-            this.reader = new PipeReader(in_pipe_path);
-            this.writer = new PipeWriter(out_pipe_path);
+            this.Reader = new PipeReader(in_pipe_path);
+            this.Writer = new PipeWriter(out_pipe_path);
         }
 
         public void Dispose()
         {
-            this.reader.Dispose();
-            this.writer.Dispose();
+            this.Reader.Dispose();
+            this.Writer.Dispose();
         }
     }
 }