Update generating_urls.md
Add updatedAt attribute
Merge pull request #315 from JulienItard/patch-1

Add updatedAt attribute
Merge pull request #313 from supertanuki/patch-1

Update generating_urls.md
Fix uppercase u in Null.
Improved documentation

In older Symfony versions you have to define {{ form_enctype(upload_form) }}
Merge pull request #317 from timhovius/master

Improved documentation
Merge pull request #316 from VermontDesignWorks/fix_default_null_case_typo

Fix uppercase u in Null.
Add a few functional tests
Remove useless steps in the travis-ci configuration
Remove useless dependencies for functional tests
Fix test dependencies
Switch to PSR-4
Update minimum Symfony version to 2.3
Simplify travis configuration
Directly specify the version constraint on symfony/symfony