Package Oriented Design Refactor

[GuilhermeMLS]

Guys, we were beginners with Go and specially with Package Oriented Design at the time our team built this boilerplate project.

There are lots of things technically wrong in this template, and now with more experience I think it should be nice to refactor it, strictly following the best practices described by Package Oriented Design and Go creators, specially those regarding package structure, imports rules, package naming, etc. I ensure that this new design could dramatically improve code quality and maintainability.

I offer my help to address this refactor, if you guys think it makes sense.