VueJS: Unknown Custom Element

I am trying Vaadin elements in our new VueJS application. I’m using webpack, npm and bower. The element works fine but I get a warnign in the console: vue.esm.js?65d7:476 [Vue warn]
: Unknown custom element: - did you register the component correctly? For recursive components, make sure to provide the “name” option. I found this two week old post on the official Github repository: https://github.com/vaadin/vaadin-grid/issues/985 which describes my problem perfectly. However there’s been no proposed solutions. I’ve tried using the polymer-webpack-loader plugin but it has no effect. I would appreciate any help.

Here’s a github repo that you can clone and run to see an example. It’s too complex to get it working on a live code editor.

https://github.com/tmpjr/vue-vaadin-demo