Add a star to the byline on sticky posts
Hide separators from screen readers
Escape the header image URL
Don't break the Headlines terms on the front page if a selected term has been split

`$term` might be false if the term has previously been shared between
taxonomies and now has been split into two by WordPress 4.1.

To avoid errors if the `headlines_category` has not been updated to use
the new ID, we try to get the term by using the `term_taxonomy_id`.
Update Codekit config file