Installer requires Node to be installed

[GraemeF]

When deploying our application we want to isolate it from changes to the installed version of Node. To do this we include our own Node.exe and use the nodeProcessCommandLine setting to tell iisnode which Node.exe to use for our application.

Unfortunately the iisnode installer requires Node to be installed before it allows iisnode to be installed, which is unnecessary.

[alensiljak]

Also, the installer expects Node to be in Program Files (x86), whereas the newer Node installations go to Program Files on 64-bit Windows.

[tjanczuk]

This was resolved as part of #178. iisnode installer no longer checks for node.js presence at installation time.

[GraemeF]

Perfect, thanks!