Refactor to PSR-4

[adrorocker]

This PR refactor the code:

• To be in compliance with PSR-4
• To be in compliance with PSR-1 at least.
• Prepare to, hopefully, publish this code in packagist.org

[kbjr]

I've been out of the world of PHP for a while now, so I'm kind of learning how to.. read again. But this mostly all looks like pretty straight-forward good stuff, and I'm inclined to pull it in.

You mentioned hoping to get the library published, is there anything more that you need beyond these changes to make that happen?

[adrorocker]

@kbjr Thanks for considering my PR. Well, I want to use this in one of my projects and I would like to add it with composer, there needs to be some configuration in the repo and packagist.com in order to accomplish this. If you like I could take care of this is you give me temporary access to the configuration of this repo and collaboration access.

Also I notice you had a gh-pages branch to host the documentation. Now you can just have the same "main" branch to serve the docs directory in https://kbjr.github.io/Git.php/ I was about to update the repo with that too but not sure what you were using to generate it. I can take care of that too if you like.

[adrorocker]

Hey there @kbjr, is there anything I can do to help on this? or have you decided not to merge it?

Thanks in advance.

[kbjr]

That docs page was old / outdated. If you would like to create new docs, I would be perfectly happy to pull those in as well.