turn on appveyor (windows CI)

.appveyor.yml

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+# adapted from https://packaging.python.org/en/latest/appveyor/
+
+
+environment:
+  # we tell Tox to use "twisted[windows]", to get pypiwin32 installed
+  #TWISTED_EXTRAS: "[windows]"
+  # that didn't work (it seems to work when I run it locally, but on appveyor
+  # it fails to install the pypiwin32 package). So don't bother telling
+  # Twisted to support windows: just install it ourselves.
+  # EXTRA_DEPENDENCY: "pypiwin32"
+  matrix:
+    # For Python versions available on Appveyor, see
+    # http://www.appveyor.com/docs/installed-software#python
+    - PYTHON: "C:\\Python27"
+    - PYTHON: "C:\\Python27-x64"
+      DISTUTILS_USE_SDK: "1"
+    - PYTHON: "C:\\Python34"
+    - PYTHON: "C:\\Python35"
+    - PYTHON: "C:\\Python36"
+    - PYTHON: "C:\\Python36-x64"
+
+install:
+  - |
+    %PYTHON%\python.exe -m pip install wheel tox
+
+# note:
+# %PYTHON% has: python.exe
+# %PYTHON%\Scripts has: pip.exe, tox.exe (and others installed by bare pip)
+
+
+build: off
+
+test_script:
+  # Put your test command here.
+  # Note that you must use the environment variable %PYTHON% to refer to
+  # the interpreter you're using - Appveyor does not do anything special
+  # to put the Python evrsion you want to use on PATH.
+  - |
+    misc\windows-build.cmd %PYTHON%\Scripts\tox.exe -e py
+
+after_test:
+  # This step builds your wheels.
+  # Again, you only need build.cmd if you're building C extensions for
+  # 64-bit Python 3.3/3.4. And you need to use %PYTHON% to get the correct
+  # interpreter
+  - |
+    misc\windows-build.cmd %PYTHON%\python.exe setup.py bdist_wheel
+
+artifacts:
+  # bdist_wheel puts your built wheel in the dist directory
+  - path: dist\*
+
+#on_success:
+#  You can use this step to upload your artifacts to a public website.
+#  See Appveyor's documentation for more details. Or you can simply
+#  access your wheels from the Appveyor "artifacts" tab for your build.

misc/windows-build.cmd

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+@echo off
+:: To build extensions for 64 bit Python 3, we need to configure environment
+:: variables to use the MSVC 2010 C++ compilers from GRMSDKX_EN_DVD.iso of:
+:: MS Windows SDK for Windows 7 and .NET Framework 4
+::
+:: More details at:
+:: https://github.com/cython/cython/wiki/64BitCythonExtensionsOnWindows
+
+IF "%DISTUTILS_USE_SDK%"=="1" (
+    ECHO Configuring environment to build with MSVC on a 64bit architecture
+    ECHO Using Windows SDK 7.1
+    "C:\Program Files\Microsoft SDKs\Windows\v7.1\Setup\WindowsSdkVer.exe" -q -version:v7.1
+    CALL "C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd" /x64 /release
+    SET MSSdk=1
+    REM Need the following to allow tox to see the SDK compiler
+    SET TOX_TESTENV_PASSENV=DISTUTILS_USE_SDK MSSdk INCLUDE LIB
+) ELSE (
+    ECHO Using default MSVC build environment
+)
+
+CALL %*