Better "equalto" implementation for Parsley.js

parsley-iff.js

var iffRecursion = false;
window.Parsley.addValidator( 'iff', {
	validateString: function( value, requirement, instance ) {
		var $partner = $( requirement );
		var isValid = $partner.val() == value;

		if ( iffRecursion ) {
			iffRecursion = false;
		} else {
			iffRecursion = true;
			$partner.parsley().validate();
		}

		return isValid;
	}
} );