Update deps & add PHPUnit Bridge

Update deps & add PHPUnit Bridge

Changelogs summary:

 - symfony/phpunit-bridge installed in version v2.7.6
   Release notes: https://github.com/symfony/phpunit-bridge/releases/tag/v2.7.6

 - twig/twig updated from v1.23.0 to v1.23.1
   See changes: https://github.com/twigphp/Twig/compare/v1.23.0...v1.23.1
   Release notes: https://github.com/twigphp/Twig/releases/tag/v1.23.1

 - doctrine/inflector updated from v1.0.1 to v1.1.0
   See changes: https://github.com/doctrine/inflector/compare/v1.0.1...v1.1.0
   Release notes: https://github.com/doctrine/inflector/releases/tag/v1.1.0

 - doctrine/cache updated from v1.5.0 to v1.5.1
   See changes: https://github.com/doctrine/cache/compare/v1.5.0...v1.5.1
   Release notes: https://github.com/doctrine/cache/releases/tag/v1.5.1

 - doctrine/doctrine-cache-bundle updated from v1.0.1 to 1.2.1
   See changes: https://github.com/doctrine/DoctrineCacheBundle/compare/v1.0.1...1.2.1
   Release notes: https://github.com/doctrine/DoctrineCacheBundle/releases/tag/1.2.1

 - doctrine/doctrine-bundle updated from v1.5.2 to 1.6.0
   See changes: https://github.com/doctrine/DoctrineBundle/compare/v1.5.2...1.6.0
   Release notes: https://github.com/doctrine/DoctrineBundle/releases/tag/1.6.0

 - friendsofsymfony/user-bundle updated from dev-master to dev-master
   See changes: https://github.com/FriendsOfSymfony/FOSUserBundle/compare/d5b28c3...45d6f40