Add SaveToFile in the mapping (#284)

* savetofile

* fix !

src/WireMock.Net/Admin/Mappings/MappingModel.cs

@@ -39,13 +39,18 @@ namespace WireMock.Admin.Mappings
         public string SetStateTo { get; set; }
 
         /// <summary>
-        /// The request.
+        /// The request model.
         /// </summary>
         public RequestModel Request { get; set; }
 
         /// <summary>
-        /// The response.
+        /// The response model.
         /// </summary>
         public ResponseModel Response { get; set; }
+
+        /// <summary>
+        /// Saves this mapping as a static mapping file.
+        /// </summary>
+        public bool? SaveToFile { get; set; }
     }
 }

src/WireMock.Net/Admin/Mappings/ResponseModel.cs

@@ -58,9 +58,9 @@ namespace WireMock.Admin.Mappings
         public EncodingModel BodyEncoding { get; set; }
 
         /// <summary>
-        /// Gets or sets a value indicating whether [use transformer].
+        /// Use Handlebars transformer.
         /// </summary>
-        public bool UseTransformer { get; set; }
+        public bool? UseTransformer { get; set; }
 
         /// <summary>
         /// Gets or sets the headers.