add socketIO for client's updates on long operations

[JulienParis]

[JulienParis]

check : https://github.com/nuxt/nuxt.js/tree/dev/examples/with-sockets

[JulienParis]

also with vue-socket-io : https://github.com/MetinSeylan/Vue-Socket.io/blob/master/docs/OLD_README.md