$.Model.validateInclusionOf(attrNames, inArray, options) -> undefined
{Array|String}
Attribute name(s) to to validate
{Array}
Array of options to test for inclusion
{Object}
(optional) Options for the validations. Valid options include 'message' and 'testIf'.
{undefined}
Validates whether the values of the specified attributes are available in a particular array. See [validation] for more on validations.