* AUTHORS: Add Travis Watkins as a contributor.

	* docs/reference: Update API docs.
	* libxfce4menu/xfce-menu-directory.{c,h},
	  libxfce4menu/xfce-menu-element.{c,h},
	  libxfce4menu/xfce-menu-item.c,
	  libxfce4menu/xfce-menu-separator.c, libxfce4menu/xfce-menu.c: Add
	  xfce_menu_element_get_visible() to XfceMenuElement. The
	  XfceMenuSeparator implementation always returns TRUE while the
	  XfceMenuItem implementation checks the Hidden/OnlyShowIn/NotShowIn
	  values of the corresponding desktop entry. XfceMenu checks the
	  Hidden/OnlyShowIn/NotShowIn values of its XfceMenuDirectory as well
	  as whether there are any visible child elements. Thanks to Travis
	  Watkins for the patch.
	* tests/test-display-menu.c, tests/test-menu-spec.c: Update tests to
	  reflect the latest API changes. Thanks to Travis for updating
	  test-display-menu.c.