September 19th

# What's New
 * Re-added `Design#owned_by?` (it turns out we do still need it, as noted in #191 
 * More test coverage

# What's Next?
 * Get a basic file uploader widget going so that the front end folks can set `featured_image`s on guide
 * Fix staging DB
 * All the other stuff in #188 
 * Merge in simon's importer rake task and give it a dry run on staging

Indent access modifiers like `private`.