Merge pull request #448 from eko/master

SONATA-185 - Add sonata_template_box twig node in some templates
Add Full pt_BR translation
Merge pull request #450 from devlucas/master

Add Full pt_BR translation
Added BaseManager
Update .travis.yml
Update composer.json
Merge pull request #451 from sylvaindeloux/SONATA-261

Added BaseManager
Fix Doctrine MediaManager to implement MediaManagerInterface too