add appveyor for Windows wheels

.appveyor.yml

@@ -0,0 +1,121 @@
+# As config was originally based on an example by Olivier Grisel. Thanks!
+# https://github.com/ogrisel/python-appveyor-demo/blob/master/appveyor.yml
+clone_depth: 50
+
+# No reason for us to restrict the number concurrent jobs
+max_jobs: 100
+
+cache:
+  - '%LOCALAPPDATA%\pip\Cache'
+
+environment:
+  global:
+      MINGW_32: C:\mingw-w64\i686-6.3.0-posix-dwarf-rt_v5-rev1\mingw32\bin
+      MINGW_64: C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev1\mingw64\bin
+      APPVEYOR_SAVE_CACHE_ON_ERROR: true
+      APPVEYOR_SKIP_FINALIZE_ON_EXIT: true
+      TEST_TIMEOUT: 1000
+      NPY_NUM_BUILD_JOBS: 4
+
+  matrix:
+    - PYTHON: C:\Python34-x64
+      PYTHON_VERSION: 3.4
+      PYTHON_ARCH: 64
+      TEST_MODE: fast
+
+    - PYTHON: C:\Python36
+      PYTHON_VERSION: 3.6
+      PYTHON_ARCH: 32
+      TEST_MODE: fast
+
+    - PYTHON: C:\Python27-x64
+      PYTHON_VERSION: 2.7
+      PYTHON_ARCH: 64
+      TEST_MODE: fast
+
+    - PYTHON: C:\Python36-x64
+      PYTHON_VERSION: 3.6
+      PYTHON_ARCH: 64
+      TEST_MODE: full
+
+init:
+  - "ECHO %PYTHON% %PYTHON_VERSION% %PYTHON_ARCH%"
+  - "ECHO \"%APPVEYOR_SCHEDULED_BUILD%\""
+  # If there is a newer build queued for the same PR, cancel this one.
+  # The AppVeyor 'rollout builds' option is supposed to serve the same
+  # purpose but it is problematic because it tends to cancel builds pushed
+  # directly to master instead of just PR builds (or the converse).
+  # credits: JuliaLang developers.
+  - ps: if ($env:APPVEYOR_PULL_REQUEST_NUMBER -and $env:APPVEYOR_BUILD_NUMBER -ne ((Invoke-RestMethod `
+        https://ci.appveyor.com/api/projects/$env:APPVEYOR_ACCOUNT_NAME/$env:APPVEYOR_PROJECT_SLUG/history?recordsNumber=50).builds | `
+        Where-Object pullRequestId -eq $env:APPVEYOR_PULL_REQUEST_NUMBER)[0].buildNumber) { `
+          raise "There are newer queued builds for this pull request, skipping build."
+        }
+
+install:
+  # Prepend newly installed Python to the PATH of this build (this cannot be
+  # done from inside the powershell script as it would require to restart
+  # the parent CMD process).
+  - SET PATH=%PYTHON%;%PYTHON%\Scripts;%PATH%
+  - if [%PYTHON_ARCH%]==[32] SET PATH=%MINGW_32%;%PATH% 
+  - if [%PYTHON_ARCH%]==[64] SET PATH=%MINGW_64%;%PATH% 
+
+  # Check that we have the expected version and architecture for Python
+  - python --version
+  - >-
+     %CMD_IN_ENV%
+     python -c "import sys,platform,struct;
+     print(sys.platform, platform.machine(), struct.calcsize('P') * 8, )"
+
+  # Upgrade to the latest pip and numpy.
+  - 'python -m pip install -U pip setuptools wheel numpy'
+
+build_script:
+  # Here, we add MinGW to the path to be able to link an GCVSPLINE.dll
+  # We then use the import library from the DLL to compile with MSVC
+  - ps: |
+      pip wheel -v -v -v --wheel-dir=dist .
+
+      # For each wheel that pip has placed in the "dist" directory
+      # First, upload the wheel to the "artifacts" tab and then
+      # install the wheel. If we have only built numpy (as is the case here),
+      # then there will be one wheel to install.
+
+      # This method is more representative of what will be distributed,
+      # because it actually tests what the built wheels will be rather than
+      # what 'setup.py install' will do and at it uploads the wheels so that
+      # they can be inspected.
+
+      ls dist -r | Foreach-Object {
+          Push-AppveyorArtifact $_.FullName
+          pip install $_.FullName
+      }
+
+test_script:
+  python runtests.py -v -n -m %TEST_MODE% -- --junitxml=%cd%\junit-results.xml
+
+after_build:
+  # Remove old or huge cache files to hopefully not exceed the 1GB cache limit.
+  #
+  # If the cache limit is reached, the cache will not be updated (of not even
+  # created in the first run). So this is a trade of between keeping the cache
+  # current and having a cache at all.
+  # NB: This is done only `on_success` since the cache in uploaded only on
+  # success anyway.
+  - C:\cygwin\bin\find "%LOCALAPPDATA%\pip" -type f -mtime +360 -delete
+  - C:\cygwin\bin\find "%LOCALAPPDATA%\pip" -type f -size +10M -delete
+  - C:\cygwin\bin\find "%LOCALAPPDATA%\pip" -empty -delete
+  # Show size of cache
+  - C:\cygwin\bin\du -hs "%LOCALAPPDATA%\pip\Cache"
+
+on_finish:
+  # We can get a nice display of test results in the "test" tab with py.test
+  # For now, this does nothing.
+  - ps: |
+      If (Test-Path .\junit-results.xml) {
+        (new-object net.webclient).UploadFile(
+          "https://ci.appveyor.com/api/testresults/junit/$($env:APPVEYOR_JOB_ID)",
+          (Resolve-Path .\junit-results.xml)
+        )
+      }
+      $LastExitCode = 0