Update appveyor for new setup. We'll see how it works.

appveyor.yml

@@ -3,30 +3,30 @@ platform:
   - x64
 environment:
   matrix:
-    - nodejs_version: '0.12'
     - nodejs_version: '4'
     - nodejs_version: '5'
     - nodejs_version: '6'
+    - nodejs_version: '7'
 install:
   - ps: Install-Product node $env:nodejs_version $env:Platform
   - node --version && npm --version
   - ps: iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-http-proxy.ps1'))
-  - npm config set proxy http://%APPVEYOR_HTTP_PROXY_IP%:%APPVEYOR_HTTP_PROXY_PORT%
-  - npm config set https-proxy http://%APPVEYOR_HTTP_PROXY_IP%:%APPVEYOR_HTTP_PROXY_PORT%
+  - IF DEFINED APPVEYOR_HTTP_PROXY_IP npm config set proxy http://%APPVEYOR_HTTP_PROXY_IP%:%APPVEYOR_HTTP_PROXY_PORT%
+  - IF DEFINED APPVEYOR_HTTP_PROXY_IP npm config set https-proxy
+  - npm config set -g msvs_version 2015
   - mkdir c:\yasm
   - set PATH=%APPDATA%\npm;c:\yasm;%PATH%
   - set CI=true
-  - npm install -g npm@latest
   - if "%PLATFORM%" == "x64" curl -o "c:\yasm\yasm.exe" http://www.tortall.net/projects/yasm/releases/yasm-1.3.0-win64.exe
   - if "%PLATFORM%" == "x86" curl -o "c:\yasm\yasm.exe" http://www.tortall.net/projects/yasm/releases/yasm-1.3.0-win32.exe
-  - node --version && npm --version && yasm --version
+  - yasm --version
   - git submodule update --init
   - if "%PLATFORM%" == "x64" npm config set python C:\Python27-x64\python.exe
   - if "%PLATFORM%" == "x86" npm config set python C:\Python27\python.exe
   - if "%PLATFORM%" == "x86" if "%NODEJS_VERSION%" == "4" npm config set -g cafile=package.json
   - if "%PLATFORM%" == "x86" if "%NODEJS_VERSION%" == "4" npm config set -g strict-ssl=false
-  - npm install -g node-gyp
-  - npm install --build-from-source --msvs_version=2015
+  - npm install
+  - npm run prebuilt-bindings -- clean build pack
 matrix:
   fast_finish: true
 build: off