Also, 3.1.0 and 3.1.1 will be yanked because of the regression.
This will solve an issue when using Paperclip without Active Record such as Mongoid. Fixes #919
This is for Rails 3.1+
IMPORTANT: There is a bug in the current release of Fog (1.3.1) that will return a broken expiring URL when the bucket name is valid for a subdomain. This is fixed per fog/fog#857 but not released in the gem yet. I have added currently FAILING tests for these cases that should pass when a new Fog is released.
This relates to #817
`#reverse_merge` did not work as planned because :default key was already existed in the hash.
Actually trying to check what's being used in the method instead of checking for something and use another thing. Thanks @jferris.
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