Using node-nightly when there is no internet connectivity

[LarryLuTW]

node-nightly check the latest version when executed, so it's unavailable when there is no internet connectivity. Just recently, I want to use node-nightly to run some script but there is no WIFI nearby. Is it possible to add some options like "--ignore-version" to use node-nightly when I have no network? Maybe I can do this and make a pull request.

[hemanth]

This is a good concern, that needs to be addressed but this PR must go into node-nightly-versions.