Recursive folder require

In environment.rb when can require all files from a folder, but only top level files. 
Know we can set a folder to require recursive with **rf** method.

@junhanamaki gave the ideia of having _init.rb file where we can require a file before all the others. Good for dependent files. 

`````````
Configs.folders do |f|
  f  'app/helpers'
  f  'app/models'
  rf 'app/routes'
  f  'app/usecases'
  f  'config/initializers'
end.require_all