[Namespace] Improved namespace support

The bundle now use Composer ``autoload_namespaces`` file to get the
bundle's namespace.
[Namespace] Fixed getNamespacesWithPackageNames

* Fixed Symfony author bundle issues
* Fixed and improved getNamespacesWithPackageNames
Fixed NamespaceGenerator.php with php-cs-fixer
[Namespace] Refactored getNamesWithPackageNames

Added a break to exit the loop when the good composer package is found
Fixed fixture path for tests
Fixed namespace collection path for fixtures
Fixed DIC configuration
Fixed services call order
Added support for namespaces without \\ at the end