fixed strict error for start_el() in both top nav and comments walkers

Strict Standards: Declaration of guts_top_bar_walker::start_el() should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /www/guts/wp-content/themes/guts/functions.php on line 399

Strict Standards: Declaration of guts_comment_walker::start_el() should be compatible with Walker_Comment::start_el(&$output, $comment, $depth = 0, $args = Array, $id = 0) in /www/guts/wp-content/themes/guts/functions.php on line 466