Added __kindof keyword where appropriate to avoid errors of the form "incompatible block pointer types sending 'GCDWebServerResponse *(^)(GCDWebServerDataRequest *__strong)' to parameter of type 'GCDWebServerProcessBlock' (aka 'GCDWebServerResponse *(^)(GCDWebServerRequest *__strong)')"

GCDWebServer/Core/GCDWebServer.h

@@ -52,7 +52,11 @@ typedef GCDWebServerRequest* (^GCDWebServerMatchBlock)(NSString* requestMethod,
  *  recommended to return a GCDWebServerErrorResponse on error so more useful
  *  information can be returned to the client.
  */
+#if __has_feature(objc_kindof)
+typedef GCDWebServerResponse* (^GCDWebServerProcessBlock)(__kindof GCDWebServerRequest* request);
+#else
 typedef GCDWebServerResponse* (^GCDWebServerProcessBlock)(GCDWebServerRequest* request);
+#endif
 
 /**
  *  The GCDWebServerAsynchronousProcessBlock works like the GCDWebServerProcessBlock
@@ -65,7 +69,11 @@ typedef GCDWebServerResponse* (^GCDWebServerProcessBlock)(GCDWebServerRequest* r
  *  useful information can be returned to the client.
  */
 typedef void (^GCDWebServerCompletionBlock)(GCDWebServerResponse* response);
+#if __has_feature(objc_kindof)
+typedef void (^GCDWebServerAsyncProcessBlock)(__kindof GCDWebServerRequest* request, GCDWebServerCompletionBlock completionBlock);
+#else
 typedef void (^GCDWebServerAsyncProcessBlock)(GCDWebServerRequest* request, GCDWebServerCompletionBlock completionBlock);
+#endif
 
 /**
  *  The port used by the GCDWebServer (NSNumber / NSUInteger).