add README
add index.jade

ref. https://gist.github.com/xtian/888338/74b74df32fc7d8396a1d80e2b9d12748bb6c135a
change <\\/script> to <\/script>

ref. https://gist.github.com/xtian/888338#comment-830321
fix README
Merge branch 'v4.2.0'