Speed up page loading: Don't load jQuery over HTTPS
Speed up page loading: Don't load jQuery over HTTPS

- IE 8 and 9 apparently won't cache jQuery when downloaded over HTTPS
  (but Chrome does).
- SSL negotiation takes time, perhaps 120 ms, when a caching browser
  downloads it the first time.

(I've tested with http://www.webpagetest.org/.)

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