Added original_filename and content_type accessors to StringIO

lib/paperclip/upfile.rb

@@ -28,7 +28,18 @@ module Paperclip
       File.size(self)
     end
   end
+end
 
+if defined? StringIO
+  class StringIO
+    attr_accessor :original_filename, :content_type
+    def original_filename
+      @original_filename ||= "stringio.txt"
+    end
+    def content_type
+      @content_type ||= "text/plain"
+    end
+  end
 end
 
 class File #:nodoc: