Ease symfony/validator version constraint slightly

Also fix a test
Merge pull request #912 from tommygnr/patch-1

Ease symfony/validator version constraint slightly
[#902]: Expand @see tag with reference recognition
Add first setup for a reference implementation
Merge branch 'develop' of github.com:phpDocumentor/phpDocumentor2 into release-2.0
Update Vagrant and Puppet to work out of the box
Merge branch 'develop' of github.com:phpDocumentor/phpDocumentor2 into release-2.0
Merge branch 'release-2.0' into 902
[#902]: Resolve @see reference to FQSEN
[#902]: Update CHANGELOG
Merge pull request #914 from mvriel/902

Fix #902: show and interpret references for @see tags