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diff --git a/node_modules/nan/nan_weak.h b/node_modules/nan/nan_weak.h
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+++ b/node_modules/nan/nan_weak.h
@@ -0,0 +1,437 @@
+/*********************************************************************
+ * NAN - Native Abstractions for Node.js
+ *
+ * Copyright (c) 2018 NAN contributors
+ *
+ * MIT License <https://github.com/nodejs/nan/blob/master/LICENSE.md>
+ ********************************************************************/
+
+#ifndef NAN_WEAK_H_
+#define NAN_WEAK_H_
+
+static const int kInternalFieldsInWeakCallback = 2;
+static const int kNoInternalFieldIndex = -1;
+
+#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 ||                      \
+  (V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))
+# define NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_ \
+    v8::WeakCallbackInfo<WeakCallbackInfo<T> > const&
+# define NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_ \
+    NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_
+# define NAN_WEAK_PARAMETER_CALLBACK_SIG_ NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_
+# define NAN_WEAK_TWOFIELD_CALLBACK_SIG_ NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_
+#elif NODE_MODULE_VERSION > IOJS_1_1_MODULE_VERSION
+# define NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_ \
+    v8::PhantomCallbackData<WeakCallbackInfo<T> > const&
+# define NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_ \
+    NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_
+# define NAN_WEAK_PARAMETER_CALLBACK_SIG_ NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_
+# define NAN_WEAK_TWOFIELD_CALLBACK_SIG_ NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_
+#elif NODE_MODULE_VERSION > NODE_0_12_MODULE_VERSION
+# define NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_ \
+    v8::PhantomCallbackData<WeakCallbackInfo<T> > const&
+# define NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_ \
+    v8::InternalFieldsCallbackData<WeakCallbackInfo<T>, void> const&
+# define NAN_WEAK_PARAMETER_CALLBACK_SIG_ NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_
+# define NAN_WEAK_TWOFIELD_CALLBACK_SIG_ NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_
+#elif NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
+# define NAN_WEAK_CALLBACK_DATA_TYPE_ \
+    v8::WeakCallbackData<S, WeakCallbackInfo<T> > const&
+# define NAN_WEAK_CALLBACK_SIG_ NAN_WEAK_CALLBACK_DATA_TYPE_
+#else
+# define NAN_WEAK_CALLBACK_DATA_TYPE_ void *
+# define NAN_WEAK_CALLBACK_SIG_ \
+    v8::Persistent<v8::Value>, NAN_WEAK_CALLBACK_DATA_TYPE_
+#endif
+
+template<typename T>
+class WeakCallbackInfo {
+ public:
+  typedef void (*Callback)(const WeakCallbackInfo<T>& data);
+  WeakCallbackInfo(
+      Persistent<v8::Value> *persistent
+    , Callback callback
+    , void *parameter
+    , void *field1 = 0
+    , void *field2 = 0) :
+        callback_(callback), isolate_(0), parameter_(parameter) {
+    std::memcpy(&persistent_, persistent, sizeof (v8::Persistent<v8::Value>));
+    internal_fields_[0] = field1;
+    internal_fields_[1] = field2;
+  }
+  inline v8::Isolate *GetIsolate() const { return isolate_; }
+  inline T *GetParameter() const { return static_cast<T*>(parameter_); }
+  inline void *GetInternalField(int index) const {
+    assert((index == 0 || index == 1) && "internal field index out of bounds");
+    if (index == 0) {
+      return internal_fields_[0];
+    } else {
+      return internal_fields_[1];
+    }
+  }
+
+ private:
+  NAN_DISALLOW_ASSIGN_COPY_MOVE(WeakCallbackInfo)
+  Callback callback_;
+  v8::Isolate *isolate_;
+  void *parameter_;
+  void *internal_fields_[kInternalFieldsInWeakCallback];
+  v8::Persistent<v8::Value> persistent_;
+  template<typename S, typename M> friend class Persistent;
+  template<typename S> friend class PersistentBase;
+#if NODE_MODULE_VERSION <= NODE_0_12_MODULE_VERSION
+# if NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
+  template<typename S>
+  static void invoke(NAN_WEAK_CALLBACK_SIG_ data);
+  template<typename S>
+  static WeakCallbackInfo *unwrap(NAN_WEAK_CALLBACK_DATA_TYPE_ data);
+# else
+  static void invoke(NAN_WEAK_CALLBACK_SIG_ data);
+  static WeakCallbackInfo *unwrap(NAN_WEAK_CALLBACK_DATA_TYPE_ data);
+# endif
+#else
+# if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 ||                     \
+  (V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))
+  template<bool isFirstPass>
+  static void invokeparameter(NAN_WEAK_PARAMETER_CALLBACK_SIG_ data);
+  template<bool isFirstPass>
+  static void invoketwofield(NAN_WEAK_TWOFIELD_CALLBACK_SIG_ data);
+# else
+  static void invokeparameter(NAN_WEAK_PARAMETER_CALLBACK_SIG_ data);
+  static void invoketwofield(NAN_WEAK_TWOFIELD_CALLBACK_SIG_ data);
+# endif
+  static WeakCallbackInfo *unwrapparameter(
+      NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_ data);
+  static WeakCallbackInfo *unwraptwofield(
+      NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_ data);
+#endif
+};
+
+
+#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 ||                      \
+  (V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))
+
+template<typename T>
+template<bool isFirstPass>
+void
+WeakCallbackInfo<T>::invokeparameter(NAN_WEAK_PARAMETER_CALLBACK_SIG_ data) {
+  WeakCallbackInfo<T> *cbinfo = unwrapparameter(data);
+  if (isFirstPass) {
+    cbinfo->persistent_.Reset();
+    data.SetSecondPassCallback(invokeparameter<false>);
+  } else {
+    cbinfo->callback_(*cbinfo);
+    delete cbinfo;
+  }
+}
+
+template<typename T>
+template<bool isFirstPass>
+void
+WeakCallbackInfo<T>::invoketwofield(NAN_WEAK_TWOFIELD_CALLBACK_SIG_ data) {
+  WeakCallbackInfo<T> *cbinfo = unwraptwofield(data);
+  if (isFirstPass) {
+    cbinfo->persistent_.Reset();
+    data.SetSecondPassCallback(invoketwofield<false>);
+  } else {
+    cbinfo->callback_(*cbinfo);
+    delete cbinfo;
+  }
+}
+
+template<typename T>
+WeakCallbackInfo<T> *WeakCallbackInfo<T>::unwrapparameter(
+    NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_ data) {
+  WeakCallbackInfo<T> *cbinfo =
+      static_cast<WeakCallbackInfo<T>*>(data.GetParameter());
+  cbinfo->isolate_ = data.GetIsolate();
+  return cbinfo;
+}
+
+template<typename T>
+WeakCallbackInfo<T> *WeakCallbackInfo<T>::unwraptwofield(
+    NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_ data) {
+  WeakCallbackInfo<T> *cbinfo =
+      static_cast<WeakCallbackInfo<T>*>(data.GetInternalField(0));
+  cbinfo->isolate_ = data.GetIsolate();
+  return cbinfo;
+}
+
+#undef NAN_WEAK_PARAMETER_CALLBACK_SIG_
+#undef NAN_WEAK_TWOFIELD_CALLBACK_SIG_
+#undef NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_
+#undef NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_
+# elif NODE_MODULE_VERSION > NODE_0_12_MODULE_VERSION
+
+template<typename T>
+void
+WeakCallbackInfo<T>::invokeparameter(NAN_WEAK_PARAMETER_CALLBACK_SIG_ data) {
+  WeakCallbackInfo<T> *cbinfo = unwrapparameter(data);
+  cbinfo->persistent_.Reset();
+  cbinfo->callback_(*cbinfo);
+  delete cbinfo;
+}
+
+template<typename T>
+void
+WeakCallbackInfo<T>::invoketwofield(NAN_WEAK_TWOFIELD_CALLBACK_SIG_ data) {
+  WeakCallbackInfo<T> *cbinfo = unwraptwofield(data);
+  cbinfo->persistent_.Reset();
+  cbinfo->callback_(*cbinfo);
+  delete cbinfo;
+}
+
+template<typename T>
+WeakCallbackInfo<T> *WeakCallbackInfo<T>::unwrapparameter(
+    NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_ data) {
+  WeakCallbackInfo<T> *cbinfo =
+       static_cast<WeakCallbackInfo<T>*>(data.GetParameter());
+  cbinfo->isolate_ = data.GetIsolate();
+  return cbinfo;
+}
+
+template<typename T>
+WeakCallbackInfo<T> *WeakCallbackInfo<T>::unwraptwofield(
+    NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_ data) {
+  WeakCallbackInfo<T> *cbinfo =
+       static_cast<WeakCallbackInfo<T>*>(data.GetInternalField1());
+  cbinfo->isolate_ = data.GetIsolate();
+  return cbinfo;
+}
+
+#undef NAN_WEAK_PARAMETER_CALLBACK_SIG_
+#undef NAN_WEAK_TWOFIELD_CALLBACK_SIG_
+#undef NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_
+#undef NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_
+#elif NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
+
+template<typename T>
+template<typename S>
+void WeakCallbackInfo<T>::invoke(NAN_WEAK_CALLBACK_SIG_ data) {
+  WeakCallbackInfo<T> *cbinfo = unwrap(data);
+  cbinfo->persistent_.Reset();
+  cbinfo->callback_(*cbinfo);
+  delete cbinfo;
+}
+
+template<typename T>
+template<typename S>
+WeakCallbackInfo<T> *WeakCallbackInfo<T>::unwrap(
+    NAN_WEAK_CALLBACK_DATA_TYPE_ data) {
+  void *parameter = data.GetParameter();
+  WeakCallbackInfo<T> *cbinfo =
+      static_cast<WeakCallbackInfo<T>*>(parameter);
+  cbinfo->isolate_ = data.GetIsolate();
+  return cbinfo;
+}
+
+#undef NAN_WEAK_CALLBACK_SIG_
+#undef NAN_WEAK_CALLBACK_DATA_TYPE_
+#else
+
+template<typename T>
+void WeakCallbackInfo<T>::invoke(NAN_WEAK_CALLBACK_SIG_ data) {
+  WeakCallbackInfo<T> *cbinfo = unwrap(data);
+  cbinfo->persistent_.Dispose();
+  cbinfo->persistent_.Clear();
+  cbinfo->callback_(*cbinfo);
+  delete cbinfo;
+}
+
+template<typename T>
+WeakCallbackInfo<T> *WeakCallbackInfo<T>::unwrap(
+    NAN_WEAK_CALLBACK_DATA_TYPE_ data) {
+  WeakCallbackInfo<T> *cbinfo =
+      static_cast<WeakCallbackInfo<T>*>(data);
+  cbinfo->isolate_ = v8::Isolate::GetCurrent();
+  return cbinfo;
+}
+
+#undef NAN_WEAK_CALLBACK_SIG_
+#undef NAN_WEAK_CALLBACK_DATA_TYPE_
+#endif
+
+#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 ||                      \
+  (V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))
+template<typename T, typename M>
+template<typename P>
+inline void Persistent<T, M>::SetWeak(
+    P *parameter
+  , typename WeakCallbackInfo<P>::Callback callback
+  , WeakCallbackType type) {
+  WeakCallbackInfo<P> *wcbd;
+  if (type == WeakCallbackType::kParameter) {
+    wcbd = new WeakCallbackInfo<P>(
+        reinterpret_cast<Persistent<v8::Value>*>(this)
+      , callback
+      , parameter);
+    v8::PersistentBase<T>::SetWeak(
+        wcbd
+      , WeakCallbackInfo<P>::template invokeparameter<true>
+      , type);
+  } else {
+    v8::Local<v8::Value>* self_v(reinterpret_cast<v8::Local<v8::Value>*>(this));
+    assert((*self_v)->IsObject());
+    v8::Local<v8::Object> self((*self_v).As<v8::Object>());
+    int count = self->InternalFieldCount();
+    void *internal_fields[kInternalFieldsInWeakCallback] = {0, 0};
+    for (int i = 0; i < count && i < kInternalFieldsInWeakCallback; i++) {
+      internal_fields[i] = self->GetAlignedPointerFromInternalField(i);
+    }
+    wcbd = new WeakCallbackInfo<P>(
+        reinterpret_cast<Persistent<v8::Value>*>(this)
+      , callback
+      , 0
+      , internal_fields[0]
+      , internal_fields[1]);
+    self->SetAlignedPointerInInternalField(0, wcbd);
+    v8::PersistentBase<T>::SetWeak(
+        static_cast<WeakCallbackInfo<P>*>(0)
+      , WeakCallbackInfo<P>::template invoketwofield<true>
+      , type);
+  }
+}
+#elif NODE_MODULE_VERSION > IOJS_1_1_MODULE_VERSION
+template<typename T, typename M>
+template<typename P>
+inline void Persistent<T, M>::SetWeak(
+    P *parameter
+  , typename WeakCallbackInfo<P>::Callback callback
+  , WeakCallbackType type) {
+  WeakCallbackInfo<P> *wcbd;
+  if (type == WeakCallbackType::kParameter) {
+    wcbd = new WeakCallbackInfo<P>(
+        reinterpret_cast<Persistent<v8::Value>*>(this)
+      , callback
+      , parameter);
+    v8::PersistentBase<T>::SetPhantom(
+        wcbd
+      , WeakCallbackInfo<P>::invokeparameter);
+  } else {
+    v8::Local<v8::Value>* self_v(reinterpret_cast<v8::Local<v8::Value>*>(this));
+    assert((*self_v)->IsObject());
+    v8::Local<v8::Object> self((*self_v).As<v8::Object>());
+    int count = self->InternalFieldCount();
+    void *internal_fields[kInternalFieldsInWeakCallback] = {0, 0};
+    for (int i = 0; i < count && i < kInternalFieldsInWeakCallback; i++) {
+      internal_fields[i] = self->GetAlignedPointerFromInternalField(i);
+    }
+    wcbd = new WeakCallbackInfo<P>(
+        reinterpret_cast<Persistent<v8::Value>*>(this)
+      , callback
+      , 0
+      , internal_fields[0]
+      , internal_fields[1]);
+    self->SetAlignedPointerInInternalField(0, wcbd);
+    v8::PersistentBase<T>::SetPhantom(
+        static_cast<WeakCallbackInfo<P>*>(0)
+      , WeakCallbackInfo<P>::invoketwofield
+      , 0
+      , count > 1 ? 1 : kNoInternalFieldIndex);
+  }
+}
+#elif NODE_MODULE_VERSION > NODE_0_12_MODULE_VERSION
+template<typename T, typename M>
+template<typename P>
+inline void Persistent<T, M>::SetWeak(
+    P *parameter
+  , typename WeakCallbackInfo<P>::Callback callback
+  , WeakCallbackType type) {
+  WeakCallbackInfo<P> *wcbd;
+  if (type == WeakCallbackType::kParameter) {
+    wcbd = new WeakCallbackInfo<P>(
+        reinterpret_cast<Persistent<v8::Value>*>(this)
+      , callback
+      , parameter);
+    v8::PersistentBase<T>::SetPhantom(
+        wcbd
+      , WeakCallbackInfo<P>::invokeparameter);
+  } else {
+    v8::Local<v8::Value>* self_v(reinterpret_cast<v8::Local<v8::Value>*>(this));
+    assert((*self_v)->IsObject());
+    v8::Local<v8::Object> self((*self_v).As<v8::Object>());
+    int count = self->InternalFieldCount();
+    void *internal_fields[kInternalFieldsInWeakCallback] = {0, 0};
+    for (int i = 0; i < count && i < kInternalFieldsInWeakCallback; i++) {
+      internal_fields[i] = self->GetAlignedPointerFromInternalField(i);
+    }
+    wcbd = new WeakCallbackInfo<P>(
+        reinterpret_cast<Persistent<v8::Value>*>(this)
+      , callback
+      , 0
+      , internal_fields[0]
+      , internal_fields[1]);
+    self->SetAlignedPointerInInternalField(0, wcbd);
+    v8::PersistentBase<T>::SetPhantom(
+        WeakCallbackInfo<P>::invoketwofield
+      , 0
+      , count > 1 ? 1 : kNoInternalFieldIndex);
+  }
+}
+#elif NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
+template<typename T, typename M>
+template<typename P>
+inline void Persistent<T, M>::SetWeak(
+    P *parameter
+  , typename WeakCallbackInfo<P>::Callback callback
+  , WeakCallbackType type) {
+  WeakCallbackInfo<P> *wcbd;
+  if (type == WeakCallbackType::kParameter) {
+    wcbd = new WeakCallbackInfo<P>(
+        reinterpret_cast<Persistent<v8::Value>*>(this)
+      , callback
+      , parameter);
+    v8::PersistentBase<T>::SetWeak(wcbd, WeakCallbackInfo<P>::invoke);
+  } else {
+    v8::Local<v8::Value>* self_v(reinterpret_cast<v8::Local<v8::Value>*>(this));
+    assert((*self_v)->IsObject());
+    v8::Local<v8::Object> self((*self_v).As<v8::Object>());
+    int count = self->InternalFieldCount();
+    void *internal_fields[kInternalFieldsInWeakCallback] = {0, 0};
+    for (int i = 0; i < count && i < kInternalFieldsInWeakCallback; i++) {
+      internal_fields[i] = self->GetAlignedPointerFromInternalField(i);
+    }
+    wcbd = new WeakCallbackInfo<P>(
+        reinterpret_cast<Persistent<v8::Value>*>(this)
+      , callback
+      , 0
+      , internal_fields[0]
+      , internal_fields[1]);
+    v8::PersistentBase<T>::SetWeak(wcbd, WeakCallbackInfo<P>::invoke);
+  }
+}
+#else
+template<typename T>
+template<typename P>
+inline void PersistentBase<T>::SetWeak(
+    P *parameter
+  , typename WeakCallbackInfo<P>::Callback callback
+  , WeakCallbackType type) {
+  WeakCallbackInfo<P> *wcbd;
+  if (type == WeakCallbackType::kParameter) {
+    wcbd = new WeakCallbackInfo<P>(
+        reinterpret_cast<Persistent<v8::Value>*>(this)
+      , callback
+      , parameter);
+    persistent.MakeWeak(wcbd, WeakCallbackInfo<P>::invoke);
+  } else {
+    v8::Local<v8::Value>* self_v(reinterpret_cast<v8::Local<v8::Value>*>(this));
+    assert((*self_v)->IsObject());
+    v8::Local<v8::Object> self((*self_v).As<v8::Object>());
+    int count = self->InternalFieldCount();
+    void *internal_fields[kInternalFieldsInWeakCallback] = {0, 0};
+    for (int i = 0; i < count && i < kInternalFieldsInWeakCallback; i++) {
+      internal_fields[i] = self->GetPointerFromInternalField(i);
+    }
+    wcbd = new WeakCallbackInfo<P>(
+        reinterpret_cast<Persistent<v8::Value>*>(this)
+      , callback
+      , 0
+      , internal_fields[0]
+      , internal_fields[1]);
+    persistent.MakeWeak(wcbd, WeakCallbackInfo<P>::invoke);
+  }
+}
+#endif
+
+#endif  // NAN_WEAK_H_