appveyor: fix node v0.8, test io.js v2.5 and v3

Author: TooTallNate

appveyor.yml

@@ -2,23 +2,35 @@
 
 # Test against these versions of Node.js.
 environment:
+  # Visual Studio Version
+  MSVS_VERSION: 2013
+  # Test against these versions of Node.js and io.js
   matrix:
+    # node.js
     - nodejs_version: "0.8"
     - nodejs_version: "0.10"
     - nodejs_version: "0.12"
+    # io.js
+    - nodejs_version: "2.5"
+    - nodejs_version: "3.2"
 
 platform:
   - x86
   - x64
 
 # Install scripts. (runs after repo cloning)
 install:
-  - ps: Install-Product node $env:nodejs_version $env:platform
+  # Get the latest stable version of Node 0.STABLE.latest
+  - ps: if($env:nodejs_version -eq "0.8") {Install-Product node $env:nodejs_version}
+  - ps: if($env:nodejs_version -ne "0.8") {Update-NodeJsInstallation (Get-NodeJsLatestBuild $env:nodejs_version)}
   # Node 0.8 comes with a too obsolete npm
-  - set PATH=%APPVEYOR_BUILD_FOLDER%\node_modules\.bin;%APPDATA%\npm;%PATH%
-  - IF "%nodejs_version%" == "0.8" npm -g install [email protected]
+  - IF %nodejs_version% == 0.8 (npm install -g [email protected])
+  # Install latest NPM only for node.js versions until built in node-gyp adds io.js support
+  # Update is required for node.js 0.8 because built in npm(node-gyp) does not know VS2013
+  - IF %nodejs_version% LSS 1 (npm install -g npm@2)
+  - IF %nodejs_version% LSS 1 set PATH=%APPDATA%\npm;%PATH%
   # Typical npm stuff.
-  - npm install
+  - npm install --msvs_version=%MSVS_VERSION%
 
 # Post-install test scripts.
 test_script: