Restructure app.js code

[r8k]

Right now, the entire app server is in one single file: app.js. We need to restructure it, so that possible enhancements become much more easy & modular to do.

--- Want to back this issue? **[Post a bounty on it!](https://www.bountysource.com/issues/1144253-restructure-app-js-code?utm_campaign=plugin&utm_content=tracker%2F284235&utm_medium=issues&utm_source=github)** We accept bounties via [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F284235&utm_medium=issues&utm_source=github).

[landrade]

Hi @r8k, you want to help to do it?

[FGRibreau]

@landrade I think so, since this is issue is more than one year old