Fix rcube_utils::explode_quoted_string() with explode(), added tests

Aleksander Machniak

2012-11-15 3a54cc50134806cc8e53abf0efa6faf416182990

 program/include/rcube_utils.php

@@ -761,7 +761,7 @@
            }
        }

        $result[] = substr($string, $p);
        $result[] = (string) substr($string, $p);

        return $result;
    }