Triggered composer update, added README doc for update process

- Removing symfony/symfony (v2.5.1)
- Installing symfony/symfony (v2.5.3)

- Removing doctrine/orm (v2.4.3)
- Installing doctrine/orm (v2.4.4)

- Removing symfony/monolog-bundle (v2.6.0)
- Installing symfony/monolog-bundle (v2.6.1)

- Installing sensiolabs/security-checker (v2.0.0)

- Removing sensio/distribution-bundle (v3.0.1)
- Installing sensio/distribution-bundle (v3.0.4)

- Removing phpunit/php-code-coverage (2.0.9)
- Installing phpunit/php-code-coverage (2.0.10)

- Removing phpunit/phpunit (4.1.3)
- Installing phpunit/phpunit (4.1.6)

- Removing squizlabs/php_codesniffer (1.5.3)
- Installing squizlabs/php_codesniffer (1.5.4)

- Updating doctrine/migrations dev-master (77d9ffe => 1a9dffa)

- Updating doctrine/doctrine-migrations-bundle dev-master (f713838 => 81575a4)
Added ".DS_Store" to gitignore