* Add Python 2.6 x86/x64 to the build matrix.
* Use clone_depth option, no need to clone the full repo.
* Build master branch and last release branch.
* Use up-to-date pip and setuptools.
* Build wheels, msi, and wininst installers.

Use different mangling prefix in foo_api.h files

Fix links to CEP 516

Progress indicator for cythonize()

Conflicts:
	CHANGES.rst

cache underlying PyCFunction of calls to unbound methods of builtins in utility code (should eventually become a general feature)

Use appveyor to build windows wheels