Method plan

nan.h:3123–3127

  ~Tap() { t_.Reset(); }  // not sure if necessary

  inline void plan(int i) {
    HandleScope scope;
    v8::Local<v8::Value> arg = New(i);
    Call("plan", New(t_), 1, &arg);
  }

  inline void ok(bool isOk, const char *msg = NULL) {
    HandleScope scope;