One might want to stop the 'Email' validator (for example) from returning all of the multiple errors about hostname, parts, etc. This is already supported by \Zend\InputFilter\Input via the setErrorMessage() method.

This PR simply adds the ability to specify this via the factory as error_message.

$this->add(array(
    'name' => 'email',
    'required' => false,
    'error_message' => 'This is not a valid email address',
    'validators' => array(
        array(
            'name' => 'EmailAddress',
        )
    )
));