Add the 'show_admin_column' argument for the 'portfolio' taxonomy.
Support the 'author' field for portfolios.
Extra arguments defined for post type registration.
Set priority to default of '10' for post type and taxonomy registrations.  This broke on recent WP update (not sure why).
Add the 'create_portfolio_items' cap to the 'administrator' role.
Add the 'create_posts' primitive/meta cap definition.