thoughtbot/paperclip — pull request #1508 by jesuisbonbon (2014-04-07 19:18:38+00:00)
Title: content_type_mappings accepts now an array of mimes for one extension

content_type_mappings accepts now an array of mimes for one extension, sometimes one file can have multiple mime-types

Paperclip.options[:content_type_mappings] = {
:jos => ["application/jos", "text/plain"]
}