Merge pull request #27 from aabdou/master

Add jackalope.factory to the DI extension
Add ValidPhpcrOdm validator
Move error message to constraint
Throw exception if document is not managed by phpcr odm
Update validator config
Use empty to check parent and name validity
Merge pull request #29 from EmmanuelVella/validator

Add ValidPhpcrOdm validator
Fix parent fieldname mapping
Merge pull request #30 from sveriger/fix_parent_validator

Fix parent fieldname mapping