Merge pull request #113 from borkweb/6269-allow-featured-image-fetch

Add another hook to allow filtering the fetching of featured comments
Don't destructively include featured comments

When featured comments are set to display in a waterfall, featured comments were added regardless of the type of waterfall - which was causing them (and posts of the `post` post type) to be displayed on archive pages where they didn't belong.
Casing
Merge pull request #114 from borkweb/non-destructive-comment-inclusion

Don't destructively include featured comments