Now that 3.3 is near, it would be a really nice thing to have the documentation explain how to use an application without bundles in your repository (vendor bundles allowed). @wouterj mentioned on slack, this could be a new subguide somewhere. The only "issue" I see at the moment is that it conflicts with the best practices. I would personally like to see this guide written in a way that a new developer can use it, but opens up the road to a stronger setup for the more experienced devs that like decoupling and explicitness.

The following things should probably be explained in this guide:

• How to register your controllers (with the new DI possibilities)
• How to do this with explicit service definitions (no auto-wiring as opposed above)
• How to register your entities if you use this with doctrine
• How to register commands in your application
• How to load resources (which is already documented via best practices, via app/Resources)
• How to manipulate the container (via kernel build() and such)
• Did I forget anything?

Closely related to symfony/symfony-standard/pull/1034

/cc @dunglas