Blabla pull request

I propose my version that is working with a mongo database. 
I think we can do better with the nodejs achitecture ( I mean the server part), but this is working.

Just launch the "server.js" with `node server.js`
Then on your browser, go to `http://localhost:8080/api/application`
And if you go in the database, you can see the line correctly inserted.

I didn't have time to redirect the client to the index.html with the node rooting.