def download_build(file)
      temp = Tempfile.new(['gadgets', file + '.rb'])
      temp.write(url_request(url_of_file(File.join('lib', 'one_gadget', 'builds', file + '.rb'))))
      temp.tap(&:close)
    end
def download_build(file)
      temp = Tempfile.new(['gadgets', file + '.rb'])
      temp.write(url_request(url_of_file(File.join('lib', 'one_gadget', 'builds', file + '.rb'))))
      temp.tap(&:close)
    end
Download the latest version of +file+ in +lib/one_gadget/builds/+ from remote repo.

 @param [String] file The filename desired.
 @return [Tempfile] The temp file be created.