remove icallback since QF2 has notcallback now

src/SemanticScuttle/QuickForm2/Rule/ICallback.php

@@ -1,25 +0,0 @@
-<?php
-require_once 'HTML/QuickForm2/Rule/Callback.php';
-
-/**
- * Custom rule that behaves like a callback but inverts the result.
- *
- * @author Christian Weiske <cweiske@php.net>
- */
-class SemanticScuttle_QuickForm2_Rule_ICallback
-    extends HTML_QuickForm2_Rule_Callback
-{
-
-   /**
-    * Validates the owner element.
-    * Inverts the return value of the callback.
-    *
-    * @return bool The value returned by a callback function
-    */
-    protected function validateOwner()
-    {
-        return !parent::validateOwner();
-    }
-}
-
-?>