Provide content type of file to fog.

lib/paperclip/storage/fog.rb

@@ -82,7 +82,8 @@ module Paperclip
             directory.files.create(fog_file.merge(
             directory.files.create(fog_file.merge(
               :body         => file,
               :body         => file,
               :key          => path(style),
               :key          => path(style),
-              :public => fog_public
+              :public       => fog_public,
+              :content_type => file.content_type.to_s.strip
             ))
             ))
           rescue Excon::Errors::NotFound
           rescue Excon::Errors::NotFound
             raise if retried
             raise if retried