THRIFT-323. csharp: TJSONProtocol

This patch adds support for the JSON Protocol to the csharp library. 

Patch: Roger Meier

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@998539 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/csharp/src/Protocol/TProtocolException.cs b/lib/csharp/src/Protocol/TProtocolException.cs
index d570bb8..207f5e9 100644
--- a/lib/csharp/src/Protocol/TProtocolException.cs
+++ b/lib/csharp/src/Protocol/TProtocolException.cs
@@ -32,6 +32,7 @@
 		public const int NEGATIVE_SIZE = 2;
 		public const int SIZE_LIMIT = 3;
 		public const int BAD_VERSION = 4;
+		public const int NOT_IMPLEMENTED= 5;
 
 		protected int type_ = UNKNOWN;