TalkingQuickly/capistrano-3-rails-template — pull request #15 by chinito (2014-04-25 10:08:06+00:00)
Title: Change Permissions on assets explicitly for Rails 4.1 

On rails 4.1 the assets folder is set 644 and owned by deploy:deploy.

So the nginx www-data user is not able to render any pictures. So we need to change the permissions to 755, as it was on rails 4.0 and prior.

This is my suggestion.