Skeleton needs update. It calls deprecated functions: add_custom_image_header() & get_current_theme().

[feralreason]

The Skeleton Theme needs an update (is throwing notices when debug is "On".)
It calls deprecated "add_custom_image_header" on line 269 of functions.php. Should use add_theme_support( 'custom-header', $args ) instead.
It calls "get_theme( get_current_theme());" on line 128. Should use wp_get_theme($stylesheet) instead.