ajout de la directive credentials_cache
suggest doctrine/cache
Merge branch 'master' into feature/allow-credentials-cache

Conflicts:
	src/M6Web/Bundle/AwsBundle/DependencyInjection/Configuration.php
	src/M6Web/Bundle/AwsBundle/Resources/config/services.yml
add a default value to the validation
Merge pull request #25 from M6Web/feature/allow-credentials-cache

Feature/allow credentials cache