config.yml & parameters.yml.dist : database_path... just was commented-out :)
Added ./clear_app_cache_logs.sh : Cleaning it, for real...
SonataEasyExtendsBundle : composer.json (dev-master) & AddKernel

See http://sonata-project.org/bundles/easy-extends/master/doc/index.html
And a nice reading :

   http://sonata-project.org/bundles/easy-extends/master/doc/reference/why.html