Appveyor path patch

Author: matteofigus

appveyor.yml

@@ -16,6 +16,7 @@ environment:
 install:
   - ps: Install-Product node $env:nodejs_version
   - npm install -g npm@2
+  - set PATH=%APPDATA%\npm;%PATH%
   - node --version
   - npm --version
   - npm install