Add appveyor build script for windows

appveyor.yml

@@ -0,0 +1,12 @@
+environment:
+  nodejs_version: "5.11"
+install:
+  - ps: Install-Product node $env:nodejs_version
+  - npm install
+build_script:
+  - npm run build
+test_script:
+  - node --version
+  - npm --version
+  - npm run lint
+  - npm test