Merge pull request #22 from Wasper/wasper

Travis - add notifications
prefix config
Missing license header
Fix unit tests
Merge pull request #24 from rn0/prefix_config

Introduce fsi_file_prefix parameter
Cleanup twig extension, Extract FileResolver service
Rename FilePathResolver -> FSiFilePathResolver
Remove duplication
Fix parameter
Merge pull request #25 from rn0/resolver

Cleanup twig extension, Extract FileResolver service
Test different symfony versions on travis
Merge pull request #30 from chives/dev

Test different symfony versions on travis
Automatic registration of custom ORM object hydrator
Fixed tests to be compatible with latest symfony/validator
Register custom hydrator only for EMs that have translatable extension enabled
Merge pull request #33 from chives/dev

Automatic registration of custom ORM object hydrator
Add File constraint