Added new product property and fixed currency method
Merge pull request #64 from sulu-cmf/feature/contentratio

[FEATURE] Added new product property and fixed currency method
Tax class and product status is shown in the current user language
Merge pull request #65 from sulu-cmf/feature/translations

[FEATURE] Tax class and product status is shown in the current user language
Added pieces as default unit for new products
Merge pull request #66 from sulu-cmf/feature/defaultunit

[FEATURE] Added pieces as default unit for new products
fixed issue with null values