Updated Composer dependencies

- Removing twig/twig (v1.15.1)
- Installing twig/twig (v1.16.0)
  Downloading: 100%

- Removing doctrine/annotations (v1.1.2)
- Installing doctrine/annotations (v1.2.0)
  Downloading: 100%

- Removing symfony/symfony (v2.5.0)
- Installing symfony/symfony (v2.5.1)
  Downloading: 100%

- Removing twig/extensions (v1.0.1)
- Installing twig/extensions (v1.1.0)
  Downloading: 100%

- Removing phpunit/php-code-coverage (2.0.8)
- Installing phpunit/php-code-coverage (2.0.9)
  Downloading: 100%

- Removing phpunit/phpunit-mock-objects (2.1.4)
- Installing phpunit/phpunit-mock-objects (2.1.5)
  Downloading: 100%

- Updating doctrine/migrations dev-master (46a031d => 77d9ffe)
  Checking out 77d9ffeb4702a8d2daab2888869786b01e609e0c