added overloads for Delete to accept a payload

Octokit/Http/Connection.cs

@@ -295,6 +295,28 @@ namespace Octokit
             return response.StatusCode;
         }
 
+        /// <summary>
+        /// Performs an asynchronous HTTP DELETE request that expects an empty response.
+        /// </summary>
+        /// <param name="uri">URI endpoint to send request to</param>
+        /// <param name="data">The object to serialize as the body of the request</param>
+        /// <returns>The returned <seealso cref="HttpStatusCode"/></returns>
+        public async Task<HttpStatusCode> Delete(Uri uri, object data)
+        {
+            Ensure.ArgumentNotNull(uri, "uri");
+            Ensure.ArgumentNotNull(data, "data");
+
+            var request = new Request
+            {
+                Method = HttpMethod.Delete,
+                Body = data,
+                BaseAddress = BaseAddress,
+                Endpoint = uri
+            };
+            var response = await Run<object>(request, CancellationToken.None);
+            return response.StatusCode;
+        }
+
         /// <summary>
         /// Base address for the connection.
         /// </summary>