Sulu Release 1.6.12 and SuluFormBundle 1.0.0-RC2

Shortly after 1.6.11 we had to release Sulu 1.6.12. Mainly because of a new doctrine release which broke Sulu. Therefore we decided to keep doctrine 2.5 for the moment. But we've already started working on a Pull Request to update doctrine to version 2.6 which probably will be released in Sulu 2.0.

Additionally we changed the default length of the SEO description from 155 to 320 because of a new recommendation. Plus, we fixed a bug for Symfony 3 which lead to an error if a URL with a dot at the end was called.

Also, a new release candidate was published for the SuluFormBundle. The new release improves the performance of the list export and allows to disable specific field types which was contributed by our community member rflorent