Use Nan::NewInstance() for constructors

nan 2.0.1 required due to introduction
of Nan::NewInstance(v8::Local<v8::Function)>, int, v8::Local<v8::Value>)
constructor:

    https://github.com/nodejs/nan/commit/29450ed1670051613ffea9dd3f980f8685feceb4

package.json

@@ -55,7 +55,7 @@
     "glob": "^5.0.13",
     "meow": "^3.3.0",
     "mkdirp": "^0.5.1",
-    "nan": "^2.0.0",
+    "nan": "^2.0.1",
     "npmconf": "^2.1.2",
     "pangyp": "^2.2.1",
     "request": "^2.58.0",

src/sass_types/boolean.cpp

@@ -23,14 +23,14 @@ namespace SassTypes
       tpl->InstanceTemplate()->SetInternalFieldCount(1);
       Nan::SetPrototypeTemplate(tpl, "getValue", Nan::GetFunction(Nan::New<v8::FunctionTemplate>(GetValue)).ToLocalChecked());
 
-      constructor.Reset(Nan::GetFunction(tpl).ToLocalChecked());
-      conslocal = Nan::New(constructor);
+      conslocal = Nan::GetFunction(tpl).ToLocalChecked();
+      constructor.Reset(conslocal);
 
-      get_singleton(false).js_object.Reset(conslocal->NewInstance());
+      get_singleton(false).js_object.Reset(Nan::NewInstance(conslocal).ToLocalChecked());
       Nan::SetInternalFieldPointer(Nan::New(get_singleton(false).js_object), 0, &get_singleton(false));
       Nan::Set(conslocal, Nan::New("FALSE").ToLocalChecked(), Nan::New(get_singleton(false).js_object));
 
-      get_singleton(true).js_object.Reset(conslocal->NewInstance());
+      get_singleton(true).js_object.Reset(Nan::NewInstance(conslocal).ToLocalChecked());
       Nan::SetInternalFieldPointer(Nan::New(get_singleton(true).js_object), 0, &get_singleton(true));
       Nan::Set(conslocal, Nan::New("TRUE").ToLocalChecked(), Nan::New(get_singleton(true).js_object));
 

src/sass_types/null.cpp

@@ -22,10 +22,10 @@ namespace SassTypes
       tpl->SetClassName(Nan::New("SassNull").ToLocalChecked());
       tpl->InstanceTemplate()->SetInternalFieldCount(1);
 
-      constructor.Reset(Nan::GetFunction(tpl).ToLocalChecked());
-      conslocal = Nan::New(constructor);
+      conslocal = Nan::GetFunction(tpl).ToLocalChecked();
+      constructor.Reset(conslocal);
 
-      get_singleton().js_object.Reset(conslocal->NewInstance());
+      get_singleton().js_object.Reset(Nan::NewInstance(conslocal).ToLocalChecked());
       Nan::SetInternalFieldPointer(Nan::New(get_singleton().js_object), 0, &get_singleton());
       Nan::Set(conslocal, Nan::New("NULL").ToLocalChecked(), Nan::New(get_singleton().js_object));
 

src/sass_types/sass_value_wrapper.h

@@ -106,7 +106,7 @@ namespace SassTypes
       }
     } else {
       v8::Local<v8::Function> cons = T::get_constructor();
-      v8::Local<v8::Object> inst = cons->NewInstance(info.Length(), &localArgs[0]);
+      v8::Local<v8::Object> inst = Nan::NewInstance(cons, info.Length(), &localArgs[0]).ToLocalChecked();
       info.GetReturnValue().Set(inst);
     }
   }