Add filter for credit card images
Fix spacing
Change filter name
Add post and body classes
Tweak return value names for consistency
Add is_singular check and class
Merge pull request #2419 from ghost1227/issue/2352

Add post and body classes
Merge branch 'issue/2409' of github.com:ghost1227/Easy-Digital-Downloads into ghost1227-issue/2409
Merge branch 'ghost1227-issue/2409' into release/2.1
Cleanup edd_show_payment_icons(). #2409