[Cython] Cython 0.20 release

[Stefan Behnel]

Arfrever Frehtes Taifersar Arahesis, 19.01.2014 14:41:
> 2 tests fail with recent snapshot of Python 3.4.
> All tests pass with Python 2.6, 2.7, 3.1, 3.2 and 3.3.
> NumPy 1.8.0 is installed for each Python version.
> 
> ======================================================================
> FAIL: acquire_release_cycle (numpy_memoryview)
> Doctest: numpy_memoryview.acquire_release_cycle
> ----------------------------------------------------------------------
> Failed example:
>     acquire_release_cycle(a)
> Expected:
>     deallocated!
> Got nothing

Thanks for testing. The bug here is not that the test fails but that it is
being executed. Py3.4 has better support for docstrings in C functions and
finds this test which was explicitly disabled for previous CPython versions.

Stefan