fix prototype entity.
tweak unique validator.
Typo fixed.
Merge pull request #43 from umpirsky/patch-1

Typo fixed.
Fix model to allow null Product when removing ProductProperty and Variant from collection
adding missing default parameter in interface
Merge pull request #44 from netounet/master

Fixing collection management in Model
Initial refactoring to use resource bundle
Fix collection handling inside Variant
Tweak validatiors, forms and configurations
Remove controllers
Fix product unique validator
Add seo fields to default product model
Add english translation for meta field labels
Fix product validator, new services definition for orm driver
Update forms and configuration to use the resource bundle
Fix product and variant to identifier fields
Use new resource bundle interfaces
Update .gitignore
CS fixes with php-cs-fixer