svn bridge to git-repositories

one of the main reasons i still use github is that they allow me to clone a repository via svn.

While this might seem a bit backward, it helps tremendously with interoperability with pre-git projects that extensively use svn:externals (and there are still some good reasons to use svn:externals instead of git submodules - like being able to checkout subtrees).

Github supports this:

Personally, I wouldn't care if the bridge was read-only (though others might see that differently)