Use gist.githubusercontent.com directly, and serve jquery over https

Do not use the `gist.github.com.ru` domain to fetch the raw gist from `gist.githubusercontent.com`(GHU), but use GHU directly in the browser. (Saves 66% of total bandwith and 100% of `gist.github.com.ru` bandwidth.)
This works perfectly in all modern browsers because they support [CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS), and GHU sets the allowed origins to all.

Also, jQuery gets served over https if the page gets served over https.