def destroy_temp(filename = nil)
      if filename.nil?
        @temp_files.each { |filename, file| file.unlink }
        @temp_files = {}
      else
        return if @temp_files[filename.to_sym].blank?
        @temp_files[filename.to_sym].unlink
        @temp_files.delete(filename.to_sym)
      end
    end
def destroy_temp(filename = nil)
      if filename.nil?
        @temp_files.each { |filename, file| file.unlink }
        @temp_files = {}
      else
        return if @temp_files[filename.to_sym].blank?
        @temp_files[filename.to_sym].unlink
        @temp_files.delete(filename.to_sym)
      end
    end
Remove all or one created temporary config file
 @see temp_it
 @param filename [String] (nil) file to destroy
   If nil, destroy all temp files