[Cython] Cython 0.22.alpha

[Robert Bradshaw]

It's been too long since we've done a release, and the features have
started to pile up, so I'm getting the ball rolling with 0.22.alpha0.
I've uploaded a tarball to
http://cython.org/release/Cython-0.22.alpha0.tar.gz; you can also get
it from github.

Let me know what breaks/works for you, and if there's anything you
think should get in. If feedback is good I'll be cutting a beta (to
the users list) next week.

- Robert