Update vendors

twig/twig (v1.15.1 => v1.16.0)
doctrine/annotations (v1.1.2 => v1.2.0)
symfony/symfony (v2.5.0 => v2.5.2)
doctrine/orm (v2.4.3 => v2.4.4)
sensio/generator-bundle (v2.3.4 => v2.3.5)
friendsofsymfony/rest-bundle (1.4.0 => 1.4.1)
phpspec/phpspec (2.0.0 => 2.0.1)
phpunit/phpunit-mock-objects (2.1.5)
phpunit/php-code-coverage (2.0.9)
phpunit/phpunit (4.1.4)
jms/metadata (1.5.0 => 1.5.1)
Remove unused uses