Merge pull request #3306 from webpack/ci/windows

[WIP] fix the appveyor build

appveyor.yml

@@ -10,7 +10,7 @@ environment:
     - nodejs_version: 6
 
 install:
-  - ps: Update-NodeJsInstallation (Get-NodeJsLatestBuild $env:nodejs_version)
+  - ps: Install-Product node (Get-NodeJsLatestBuild $env:nodejs_version) x64
   - npm install yarn -g
   - yarn install
   - yarn link

package.json

@@ -85,7 +85,7 @@
   "scripts": {
     "test": "mocha --harmony --check-leaks",
     "travis": "npm run cover -- --report lcovonly",
-    "appveyor": "mocha --harmony",
+    "appveyor": "node --max_old_space_size=4096 node_modules\\mocha\\bin\\mocha --harmony",
     "build:examples": "cd examples && node buildAll.js",
     "pretest": "npm run lint-files",
     "postcover": "npm run lint-files && npm run nsp",