Issue #2173719 by dawehner, tim.plunkett: Remove the fork of doctrine/common.

composer.json

composer.lock

core/vendor/autoload.php

core/vendor/composer/autoload_real.php

core/vendor/composer/installed.json

core/vendor/doctrine/common/.gitignore

core/vendor/doctrine/common/.travis.yml

core/vendor/doctrine/common/composer.json

core/vendor/doctrine/common/composer.lock

...trine/Common/Proxy/Exception/UnexpectedValueException.php

...trine/common/lib/Doctrine/Common/Proxy/ProxyGenerator.php

...ctrine/Tests/Common/Reflection/ExampleAnnotationClass.php