ACF PRO v5.1.1 update

Changelog

• Image field: Added basic file uploader for non logged in users
• File field: Added basic file uploader for non logged in users
• API: Added $format_value parameter to the functions get_sub_field, the_sub_field and get_sub_field_object
• API: Added $load_value parameter to the function get_sub_field_object
• API: Added logic in have_rows function to allow for either field name or key
• Core: Reverted acf_save_post function back to an action with priority of 10.
• Core: Fixed compatibility bug with Shopp plugin
• Field group: Fixed bug where sub fields were deleted when moving a repeater field to another group