Vitaliy Demidov

We have to provide support of UniqueEntity validation for the case when multiple-column are set `@UniqueEntity(fields={"field1", "field2", "fieldN"})`: ``` php

We should provide cross-framework support for these: [Resources/views/Constraints/UniqueEntityValidator.js.twig](https://github.com/Abhoryo/APYJsFormValidationBundle/blob/master/Resources/views/Constraints/UniqueEntityValidator.js.twig) [Resources/views/Constraints/EmailValidator.js.twig](https://github.com/Abhoryo/APYJsFormValidationBundle/blob/master/Resources/views/Constraints/EmailValidator.js.twig)