Make default implementation for GCDWebServerRequest and GCDWebServerResponse ignore bodies

CGDWebServer/GCDWebServerRequest.m

@@ -249,8 +249,7 @@
 }
 
 - (BOOL)writeData:(NSData*)data error:(NSError**)error {
-  [self doesNotRecognizeSelector:_cmd];
-  return NO;
+  return YES;
 }
 
 - (BOOL)close:(NSError**)error {

CGDWebServer/GCDWebServerResponse.m

@@ -212,8 +212,7 @@
 }
 
 - (NSData*)readData:(NSError**)error {
-  [self doesNotRecognizeSelector:_cmd];
-  return nil;
+  return [NSData data];
 }
 
 - (void)close {