Whitespace in Windows Path results in binaries not being located

[tristanchanson]

I found that when configuring to use NodeJS on windows binaries were not being located due to path containing spaces. Please accept this pull request which strips the whitespace from the paths found in windows.

Thanks,

[rails-bot]

Thanks for the pull request, and welcome! The Rails team is excited to review your changes, and you should hear from @schneems (or someone else) soon.

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