THRIFT-3337 Add testBool method to cross tests

This closes #611
diff --git a/lib/csharp/test/ThriftTest/TestServer.cs b/lib/csharp/test/ThriftTest/TestServer.cs
index 0e9fe05..b5cc73c 100644
--- a/lib/csharp/test/ThriftTest/TestServer.cs
+++ b/lib/csharp/test/ThriftTest/TestServer.cs
@@ -73,6 +73,12 @@
                 return thing;
             }
 
+            public bool testBool(bool thing)
+            {
+                Console.WriteLine("testBool(" + thing + ")");
+                return thing;
+            }
+
             public sbyte testByte(sbyte thing)
             {
                 Console.WriteLine("testByte(" + thing + ")");