OK, well, I did some playing about with VS 2013 and NTVS and it seems that this menu option is only available when you have a Node.js solution open.
So, not a big issue but could probably update the docs here: https://nodejstools.codeplex.com/wikipage?title=PostInstallation
So, not a big issue but could probably update the docs here: https://nodejstools.codeplex.com/wikipage?title=PostInstallation