Add featured image support to feed items
Add a single template to override spine default
Ignore all plugins, be explicit about those allowed
Convert to spine single layout for single template
Ensure the single template is only used with feed items
Duplicate current structure from articles/post template in feed item template
Show the full content and featured image for single feed item views

These are only shown to authenticated users.
Clear unused items from single template
Previous and next feed item links need padding
Switch to teaser-image post thumbnail size
s/Recent WNPA Syndication Items/Recent Articles/
Add featured images to the feed item feed

If a feed item has a featured image assigned to it, provide an
element for media:thumbnail
Only provide custom RSS elements for the feed item post type
Merge pull request #45 from washingtonstateuniversity/featured-images

[PR] Add support for featured images to feed items