You can clone with
HTTPS or Subversion.
looking into making browser extensions and gems/packages that give the developer a synchronous copy of the entire cdnjs.com repository. Is it in this projects philosophy to support cdn hosted libraries. e.g. you could throw in an option -cdn which sets up the library to use a cdn link instead for that file.
So instead of mashing jquery into your require.js build instead use a cdn version such that it will be faster in production because jquery is usually cached.
Yes, this is something I'd like to support since Jam will probably need to know which dependencies will be made available via CDN so it doesn't add unused packages or complain about missing dependencies when you install a package from the repository.
Not sure how this will work yet...