title: ClientSideValidations with Cocoon
body: <p>I'm using client_side_validations(3.2.0.beta.3) and client_side_validations-formtastic (2.0.0.beta.3)
  On the form I have nested fields that is added with help of the cocoon gem (https://github.com/nathanvda/cocoon) and validations throw an error 'validators is undefined'
  I think that problem is that FromBuilder for nested fields from cocoon is not known by client_side_validations. Did anybody have this problem and find out solution?</p>