Add support for new int_id type that has been added to recent version of doctrine odm bundle

- https://github.com/doctrine/mongodb-odm/commit/df334908aa1240ed7cd22c54bdc5eb8b011f51e8
Merge pull request #416 from HisashiAruji/add-dbtype-to-odm-guesser

Add support for new int_id type that has been added to recent version of doctrine odm bundle