Support for validator class in validation arrays

[jbescoyez]

Changes proposed in this pull request

Class validators are great!
However, they do not work when there is more than 1 validation for a given attribute.

It would be perfect if this kind of validator map could be supported:

const validatorMap = {
  name: [
    validatePresence(true),
    validateLength({ min: 4 })
    new PersonalValidator()
  ],
};

[snewcomer]

Oh interesting! Thanks for the PR. I'll look to fix this weekend.

[jbescoyez]

Tnx @snewcomer