Use Install-Product node instead of Update-NodeJsInstallation
Use Install-Product node instead of Update-NodeJsInstallation

http://help.appveyor.com/discussions/suggestions/810-nodejs-400-is-out
`Update-NodeJsInstallation (Get-NodeJsLatestBuild $env:nodejs_version)`
command doesn't work with Node 4 yet.

https://github.com/nodejs/nan/issues/444#issuecomment-138896865

IndigoUnited/node-cross-spawn-async