XXX review feedback from keith
XXX rework to avoid changing api
XXX well, it works now...

@@ -98,10 +98,12 @@
 
                 target->Set(v8::String::NewSymbol(v8plus_js_factory_name),
                     v8::FunctionTemplate::New(
                     v8plus::ObjectWrap::cons)->GetFunction());
         }
+
+        v8plus_crossthread_init();
 }
 
 v8::Handle<v8::Value>
 v8plus::ObjectWrap::_new(const v8::Arguments &args)
 {