Fix typo in dashboard.rst
Minor documentation fixes.
Fixed dev dependencies in composer.json

Since jms/translation-bundle is only working with sf 2.2 from
version 1.1.x-dev, I updated the composer.json file to add the
@dev flag to the translation bundle version definition.

Now the --dev requirements can be isntalled again.
Implemented ConstraintValidator::validate()

Since version 2.1 of symfony/validator, ConstraintValidator::isValid()
is deprecated an triggers an E_DEPRECATED error.

Unfortunately the error handling in some circumstances triggers
SIGSEGV in PHP-FPM (I havn't been able to pinpoint the exact cause).

Now isValid() is just a BC wrapper for validate() not triggering any
errors.
Fix ukrainian translation
Merge branch 'fixuktranslation'
added some missing translations
Merge pull request #1346 from ehsan89/patch-2

added some missing translations
Merge pull request #1301 from spolischook/master

Fix ukrainian translation
Merge pull request #1298 from tPl0ch/hotfix/composer-dev-requirements

Fixed dev dependencies in composer.json
Merge pull request #1299 from tPl0ch/hotfix/constraint-validator-deprecated

Implemented ConstraintValidator::validate()
added missing option 'label_catalogue' for dashboard groups in di configuration
Fix for PR1345
Added comments to warn about the discussion in sonata-project/SonataAdminBundle#1351
Merge pull request #1351 from ddebree/PR1345

Fix for PR1345 - Form groups missing description
Merge pull request #1287 from CdWeb/patch-1

Fix typo in dashboard.rst
added feature to wire extensions dynamically using configuration
enhance and update bulgarian translation
remove slugify filter in tab id generation

slugify function doesn't work correctly on Russian symbols, so we may use index of tab without name
Merge pull request #1354 from wiistriker/patch-1

remove slugify filter in tab id generation