Fix exec paths to work with Windows

[JamesJansson]

If you have a space in your path (e.g. a space in your user name, a common occurrence in Windows)
e.g.
C:\Users\James Jansson\Documents\GitKraken\project-name>nvm use 10.12.0
exit status 1: 'C:\Users\James' is not recognized as an internal or external command,
operable program or batch file.

You will have a failure. Suggest quote marks to be added around path in exec command.

nvm-windows/src/nvm/node/node.go

Line 24 in 0a258f8

cmd := exec.Command("node","-p","console.log(process.execPath)")

[coreybutler]

This issue is already resolved in the master branch, which is tentatively v1.1.8 (i.e. the next release). See #355.

[nealoke]

@coreybutler is it possible to already use the latest version where this is fixed? Because now I can't use it 😢