DRY : take into account default childrens values from admingenerator_generator.twig configuration
DRY : take into account default configuration values for admingenerator_generator.twig parameters
[TESTS] Add tests on configuration default values
Remove hard coded configuration of parameter 'session.flashbag.class' : it's not to this bundle
to define it.
Add comments and rename some variables
[FIX] ConfigurationTest fix on call on processConfiguration() function
[FIX] Test/DependencyInjection/ConfigurationTest mal formed
[FIX] scrutinizer errors
[FIX] Scrutinizer error
Merge pull request #375 from sescandell/dic_configuration

DIC : Configuration : tests and improvments