Merge pull request #16 from caxy/feature-list_diffing-new

Missed an array_column in ListDiff. Updated to use ArrayColumn function.

Author: jschroed91

lib/Caxy/HtmlDiff/ListDiff.php

@@ -240,7 +240,7 @@ function ($v) use ($percent) {
          * Loop through all the old lists, any that has not been added, will be added as:
          * array( new => null, old => oldItemId )
          */
-        $matchColumns = array_column($matches, 'old');
+        $matchColumns = $this->getArrayColumn($matches, 'old');
         foreach ($this->childLists['old'] as $thisKey => $thisList) {
             if (!in_array($thisKey, $matchColumns)) {
                 $matches[] = array('new' => null, 'old' => $thisKey);