Since jquery asset is the fall-back solution when cdn is not available, it should be mentioned that jquery.js still need to be precompiled in production . In this case, it should be added into config.assets.precompile of config/environments/production.
I think a nicer solution might be to fall back to an alternative CDN. For example, if you choose Google and their CDN is down, then fallback to Microsoft (and vice versa).
jquery still needs to be precompiled separately. fixes #2.
Somehow I didn't receive notification for the tickets, but the README is now fixed. Thanks!