Fix SINTERSTORE and SUNIONSTORE to accept an array for the list of source keys.

lib/Predis/Commands/SetIntersectionStore.php

@@ -7,6 +7,9 @@ use Predis\Utils;
 class SetIntersectionStore extends Command {
     public function getId() { return 'SINTERSTORE'; }
     public function filterArguments(Array $arguments) {
-        return Utils::filterArrayArguments($arguments);
+        if (count($arguments) === 2 && is_array($arguments[1])) {
+            return array_merge(array($arguments[0]), $arguments[1]);
+        }
+        return $arguments;
     }
 }