Add appveyor testing for windows.

appveyor.yml

@@ -0,0 +1,35 @@
+version: 0.0.{build}
+environment:
+  matrix:
+    - nodejs_version: "0.8"
+    - nodejs_version: "0.10"
+    - nodejs_version: "0.12"
+    - nodejs_version: "1.8"
+    - nodejs_version: "2.5.0"
+    - nodejs_version: "3.3.0"
+    - nodejs_version: "4"
+    - nodejs_version: "5"
+os:
+  - Visual Studio 2015
+  - Visual Studio 2013
+install:
+  - ps: Install-Product node $env:nodejs_version x64
+  # Sets Windows 7.1 SDK env vars. Required for node 0.8, 0.10, 1.8 builds:
+  - '"C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd" /x64'
+  #- if "%nodejs_version%" == "0.8" (call "C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd" /x64)
+  #- if "%nodejs_version%" == "0.10" (call "C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd" /x64)
+  # Upgrade npm for node 0.8:
+  - if "%nodejs_version%" == "0.8" (npm install -g [email protected])
+  - if "%nodejs_version%" == "0.8" (set "PATH=%APPDATA%\npm;%PATH%")
+  - node -v
+  - npm -v
+  - npm install -g node-gyp
+  # Put GTK in C:/
+  - curl -fLsS -o 'gtk.zip' 'http://ftp.gnome.org/pub/GNOME/binaries/win64/gtk+/2.22/gtk+-bundle_2.22.1-20101229_win64.zip'
+  - 7z x gtk.zip -oGTK > nul
+  - mv GTK/ C:/
+  - if "%os%" == "Visual Studio 2015" (set GYP_MSVS_VERSION=2015)
+  - npm install
+build: off
+test_script:
+- cmd: npm test