May I suggest you take a look at https://getcomposer.org/, that way you won't ever need your application/third_party folder.

composer is a dependency manager for PHP and does its job really really well.

I've worked on several projects with it and never regretted it.

Personally, I think the indent is enough to visually separate the block.

And Allman style means more scrolling and less code fitting on the screen, which is bad.