Modified IntelliWidget_Walker::start_el() to match Walker::start_el() method signature to avoid Strict Standards notices in WP 3.6


git-svn-id: https://plugins.svn.wordpress.org/intelliwidget-per-page-featured-posts-and-menus/branches/branch-1.1.1@753875 b8457f37-d9ea-0310-8a92-e5e31aec5664