unescape_rjs

# File actionpack/lib/action_dispatch/testing/assertions/selector.rb, line 628
        def unescape_rjs(rjs_string)
          # RJS encodes double quotes and line breaks.
          unescaped= rjs_string.gsub('\"', '"')
          unescaped.gsub!(/\\\//, '/')
          unescaped.gsub!('\n', "\n")
          unescaped.gsub!('\076', '>')
          unescaped.gsub!('\074', '<')
          # RJS encodes non-ascii characters.
          unescaped.gsub!(RJS_PATTERN_UNICODE_ESCAPED_CHAR) {|u| [$1.hex].pack('U*')}
          unescaped
        end