Being able to pass router to new adhoc Vue instance

[Benal78]

While using component in vuejs-dialog, the component may rely on router.
Unfortunately as the vuejs-dialog is creating a new dedicated Vue root, the existing plugin are not passed...

This solution, allow to pass any plugin to vuejs-dialog new root...

caller code sample

Vue.use(VuejsDialog, { forwardPlugin: { router } } );