nodejs c++ addon -- unable to node-gyp build using nan module - node.js

Question

I am learning how to build C/C++ addons for nodejs.
I could successfully node-gyp configure, node-gyp build and run node index.js on a simple hellow world program. So, my basic setup is working. The below code (copy-paste from official nodejs documentation) is the working version of my C++ code.
//hello.cc
//#include <node.h>
//#include <nan.h>
#include "./node_modules/nan/nan.h"
#include <iostream>
using namespace v8;
namespace demo {
using v8::FunctionCallbackInfo;
using v8::Isolate;
using v8::Local;
using v8::Object;
using v8::String;
using v8::Value;
void Method (const FunctionCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();
std::cout << "Executing some stupid func..." << std::endl;
args.GetReturnValue().Set(String::NewFromUtf8(isolate, "world"));
}
void init(Local<Object> exports) {
NODE_SET_METHOD(exports, "hello", Method);
}
NODE_MODULE(addon, init)
} // namespace demo
However, when I use Nan module, and the version of code documented in the nan site, I get compilation errors indicating NanScope is not declared in this scope.
//hello.cc
#include "./node_modules/nan/nan.h"
#include <iostream>
using namespace v8;
NAN_METHOD(Method) {
Nan::NanScope();
NanReturnValue(String::New("world"));
}
void init(Handle<Object> exports) {
exports->Set(NanSymbol("hello"),
FunctionTemplate::New(Method)->GetFunction());
}
NODE_MODULE(hello, init)
Part of the error output...
make: Entering directory '/home/rvnath/projects/comviva/node-addons/hello-world/build'
CXX(target) Release/obj.target/addon/hello1.o
../hello1.cc: In function ‘Nan::NAN_METHOD_RETURN_TYPE Method(Nan::NAN_METHOD_ARGS_TYPE)’:
../hello1.cc:7:14: error: ‘NanScope’ was not declared in this scope
NanScope();
^
After a bit of googling around, a few sites pointed out that we should be using Nan::Scope, and that the Nan documentation was out-of-date. I tried the change but it still didn't work. It gives an error saying "Scope is not a member of Nan".
I am unable to find, how to use the Nan version correctly. Any help here will be highly appreciated.