[Cython] Cython 0.26 release

[Robert Bradshaw]

I'd like to officially start off the release process with an alpha
candidate. This does necessarily contain everything that will be in
the final release, but given the amount of time that has passed I
would recommend everyone test this out with their projects sooner
rather than later.

Download: https://github.com/cython/cython/archive/0.26.alpha0.zip
Initial changelog: https://github.com/cython/cython/blob/0.26.alpha0/CHANGES.rst

Please feel free to respond to this thread or file bugs as necessary.

Thanks,
Robert