Fixed compile issues on Node 4

[martinheidegger]

I ran into compile errors when trying to install kissfft on Node 4.0

../src/bindings.cpp:20:23: error: unknown class name 'NanAsyncWorker'; did you mean 'Nan::AsyncWorker'?
class Worker : public NanAsyncWorker {
                      ^~~~~~~~~~~~~~
                      Nan::AsyncWorker
../node_modules/nan/nan.h:1452:22: note: 'Nan::AsyncWorker' declared here
/* abstract */ class AsyncWorker {
                     ^
../src/bindings.cpp:25:10: error: unknown type name 'NanCallback'
  Worker(NanCallback* callback, Local<Object> input, Local<Object> output);
         ^
../src/bindings.cpp:60:45: error: unknown type name 'NanCallback'
Worker<cfg_type, in_type, out_type>::Worker(NanCallback *callback, Local<Object> input, Local<Object> output)
                                            ^
../src/bindings.cpp:62:21: error: no member named 'GetIndexedPropertiesExternalArrayDataLength' in 'v8::Object'
  int nfft = input->GetIndexedPropertiesExternalArrayDataLength();
             ~~~~~  ^
../src/bindings.cpp:63:23: error: no member named 'GetIndexedPropertiesExternalArrayDataLength' in 'v8::Object'
  if (nfft == output->GetIndexedPropertiesExternalArrayDataLength())
              ~~~~~~  ^
../src/bindings.cpp:68:32: error: no member named 'GetIndexedPropertiesExternalArrayData' in 'v8::Object'
  in = (const in_type*) input->GetIndexedPropertiesExternalArrayData();
                        ~~~~~  ^
../src/bindings.cpp:69:29: error: no member named 'GetIndexedPropertiesExternalArrayData' in 'v8::Object'
  out = (out_type*) output->GetIndexedPropertiesExternalArrayData();
                    ~~~~~~  ^
../src/bindings.cpp:79:3: error: use of undeclared identifier 'NanScope'
  NanScope();
  ^
../src/bindings.cpp:82:29: error: use of undeclared identifier 'NanNull'
  Handle<Value> argv[2] = { NanNull(), output };
                            ^
../src/bindings.cpp:92:3: error: use of undeclared identifier 'NanScope'
  NanScope();
  ^
../src/bindings.cpp:94:33: error: use 'template' keyword to treat 'As' as a dependent template name
  Local<Object> input = args[0].As<Object>();
                                ^
                                template
../src/bindings.cpp:94:25: error: use of undeclared identifier 'args'
  Local<Object> input = args[0].As<Object>();
                        ^
../src/bindings.cpp:95:34: error: use 'template' keyword to treat 'As' as a dependent template name
  Local<Object> output = args[1].As<Object>();
                                 ^
                                 template
../src/bindings.cpp:95:26: error: use of undeclared identifier 'args'
  Local<Object> output = args[1].As<Object>();
                         ^
../src/bindings.cpp:96:38: error: use 'template' keyword to treat 'As' as a dependent template name
  Local<Function> callback = args[2].As<Function>();
                                     ^
                                     template
../src/bindings.cpp:96:30: error: use of undeclared identifier 'args'
  Local<Function> callback = args[2].As<Function>();
                             ^
../src/bindings.cpp:98:3: error: unknown type name 'NanCallback'
  NanCallback* nanCallback = new NanCallback(callback);
  ^
../src/bindings.cpp:98:34: error: unknown type name 'NanCallback'
  NanCallback* nanCallback = new NanCallback(callback);
                                 ^
../src/bindings.cpp:101:61: error: use of undeclared identifier 'kExternalFloatArray'
      input->GetIndexedPropertiesExternalArrayDataType() != kExternalFloatArray ||
                                                            ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
make: *** [Release/obj.target/kissfft/src/bindings.o] Error 1

this should perhaps fix them?

[martinheidegger]

Seems like something is broken?